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-15=10x-40
We move all terms to the left:
-15-(10x-40)=0
We get rid of parentheses
-10x+40-15=0
We add all the numbers together, and all the variables
-10x+25=0
We move all terms containing x to the left, all other terms to the right
-10x=-25
x=-25/-10
x=2+1/2
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