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3\left(3x+7\right)-5\left(8-x\right)=15x-15
Multiply both sides of the equation by 15, the least common multiple of 5,3.
9x+21-5\left(8-x\right)=15x-15
Use the distributive property to multiply 3 by 3x+7.
9x+21-40+5x=15x-15
Use the distributive property to multiply -5 by 8-x.
9x-19+5x=15x-15
Subtract 40 from 21 to get -19.
14x-19=15x-15
Combine 9x and 5x to get 14x.
14x-19-15x=-15
Subtract 15x from both sides.
-x-19=-15
Combine 14x and -15x to get -x.
-x=-15+19
Add 19 to both sides.
-x=4
Add -15 and 19 to get 4.
x=-4
Multiply both sides by -1.