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4x+25=-x+40
We move all terms to the left:
4x+25-(-x+40)=0
We add all the numbers together, and all the variables
4x-(-1x+40)+25=0
We get rid of parentheses
4x+1x-40+25=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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