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3\times 3\left(1-2x\right)-5\left(7-2x\right)=30
Multiply both sides of the equation by 15, the least common multiple of 5,3.
9\left(1-2x\right)-5\left(7-2x\right)=30
Multiply 3 and 3 to get 9.
9-18x-5\left(7-2x\right)=30
Use the distributive property to multiply 9 by 1-2x.
9-18x-35+10x=30
Use the distributive property to multiply -5 by 7-2x.
-26-18x+10x=30
Subtract 35 from 9 to get -26.
-26-8x=30
Combine -18x and 10x to get -8x.
-8x=30+26
Add 26 to both sides.
-8x=56
Add 30 and 26 to get 56.
x=\frac{56}{-8}
Divide both sides by -8.
x=-7
Divide 56 by -8 to get -7.