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-28+3x=40+20x
We move all terms to the left:
-28+3x-(40+20x)=0
We add all the numbers together, and all the variables
3x-(20x+40)-28=0
We get rid of parentheses
3x-20x-40-28=0
We add all the numbers together, and all the variables
-17x-68=0
We move all terms containing x to the left, all other terms to the right
-17x=68
x=68/-17
x=-4
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