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31=5x+4(-x+10)
We move all terms to the left:
31-(5x+4(-x+10))=0
We add all the numbers together, and all the variables
-(5x+4(-1x+10))+31=0
We calculate terms in parentheses: -(5x+4(-1x+10)), so:We get rid of parentheses
5x+4(-1x+10)
We multiply parentheses
5x-4x+40
We add all the numbers together, and all the variables
x+40
Back to the equation:
-(x+40)
-x-40+31=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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