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3\left(x+3\right)+7\left(2m-5\right)=7\left(3m-5\right)-21\times 25
Multiply both sides of the equation by 21, the least common multiple of 7,3.
3x+9+7\left(2m-5\right)=7\left(3m-5\right)-21\times 25
Use the distributive property to multiply 3 by x+3.
3x+9+14m-35=7\left(3m-5\right)-21\times 25
Use the distributive property to multiply 7 by 2m-5.
3x-26+14m=7\left(3m-5\right)-21\times 25
Subtract 35 from 9 to get -26.
3x-26+14m=21m-35-21\times 25
Use the distributive property to multiply 7 by 3m-5.
3x-26+14m=21m-35-525
Multiply -21 and 25 to get -525.
3x-26+14m=21m-560
Subtract 525 from -35 to get -560.
3x-26+14m-21m=-560
Subtract 21m from both sides.
3x-26-7m=-560
Combine 14m and -21m to get -7m.
-26-7m=-560-3x
Subtract 3x from both sides.
-7m=-560-3x+26
Add 26 to both sides.
-7m=-534-3x
Add -560 and 26 to get -534.
-7m=-3x-534
The equation is in standard form.
\frac{-7m}{-7}=\frac{-3x-534}{-7}
Divide both sides by -7.
m=\frac{-3x-534}{-7}
Dividing by -7 undoes the multiplication by -7.
m=\frac{3x+534}{7}
Divide -534-3x by -7.
3\left(x+3\right)+7\left(2m-5\right)=7\left(3m-5\right)-21\times 25
Multiply both sides of the equation by 21, the least common multiple of 7,3.
3x+9+7\left(2m-5\right)=7\left(3m-5\right)-21\times 25
Use the distributive property to multiply 3 by x+3.
3x+9+14m-35=7\left(3m-5\right)-21\times 25
Use the distributive property to multiply 7 by 2m-5.
3x-26+14m=7\left(3m-5\right)-21\times 25
Subtract 35 from 9 to get -26.
3x-26+14m=21m-35-21\times 25
Use the distributive property to multiply 7 by 3m-5.
3x-26+14m=21m-35-525
Multiply -21 and 25 to get -525.
3x-26+14m=21m-560
Subtract 525 from -35 to get -560.
3x+14m=21m-560+26
Add 26 to both sides.
3x+14m=21m-534
Add -560 and 26 to get -534.
3x=21m-534-14m
Subtract 14m from both sides.
3x=7m-534
Combine 21m and -14m to get 7m.
\frac{3x}{3}=\frac{7m-534}{3}
Divide both sides by 3.
x=\frac{7m-534}{3}
Dividing by 3 undoes the multiplication by 3.
x=\frac{7m}{3}-178
Divide 7m-534 by 3.