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-15-9x=-40-4x
We move all terms to the left:
-15-9x-(-40-4x)=0
We add all the numbers together, and all the variables
-9x-(-4x-40)-15=0
We get rid of parentheses
-9x+4x+40-15=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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