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5x-3x=15-55
We move all terms to the left:
5x-3x-(15-55)=0
We add all the numbers together, and all the variables
5x-3x-(-40)=0
We add all the numbers together, and all the variables
2x+40=0
We move all terms containing x to the left, all other terms to the right
2x=-40
x=-40/2
x=-20
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