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7(3-4x)-5(2x+30)=0
We add all the numbers together, and all the variables
7(-4x+3)-5(2x+30)=0
We multiply parentheses
-28x-10x+21-150=0
We add all the numbers together, and all the variables
-38x-129=0
We move all terms containing x to the left, all other terms to the right
-38x=129
x=129/-38
x=-3+15/38
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