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3(x-)=5x-4+3(7-)
We move all terms to the left:
3(x-)-(5x-4+3(7-))=0
We add all the numbers together, and all the variables
3(+x)-(5x-4+30)=0
We multiply parentheses
3x-(5x-4+30)=0
We get rid of parentheses
3x-5x+4-30=0
We add all the numbers together, and all the variables
-2x-26=0
We move all terms containing x to the left, all other terms to the right
-2x=26
x=26/-2
x=-13
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