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8x+2(3x-20)=4x+30
We move all terms to the left:
8x+2(3x-20)-(4x+30)=0
We multiply parentheses
8x+6x-(4x+30)-40=0
We get rid of parentheses
8x+6x-4x-30-40=0
We add all the numbers together, and all the variables
10x-70=0
We move all terms containing x to the left, all other terms to the right
10x=70
x=70/10
x=7
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