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10x-35=15x+40=4x+7
We move all terms to the left:
10x-35-(15x+40)=0
We get rid of parentheses
10x-15x-40-35=0
We add all the numbers together, and all the variables
-5x-75=0
We move all terms containing x to the left, all other terms to the right
-5x=75
x=75/-5
x=-15
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