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5x-70-(4x-30)=180
We move all terms to the left:
5x-70-(4x-30)-(180)=0
We add all the numbers together, and all the variables
5x-(4x-30)-250=0
We get rid of parentheses
5x-4x+30-250=0
We add all the numbers together, and all the variables
x-220=0
We move all terms containing x to the left, all other terms to the right
x=220
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