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5x-7x+55=3x+30
We move all terms to the left:
5x-7x+55-(3x+30)=0
We add all the numbers together, and all the variables
-2x-(3x+30)+55=0
We get rid of parentheses
-2x-3x-30+55=0
We add all the numbers together, and all the variables
-5x+25=0
We move all terms containing x to the left, all other terms to the right
-5x=-25
x=-25/-5
x=+5
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