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36=4(20-x)
We move all terms to the left:
36-(4(20-x))=0
We add all the numbers together, and all the variables
-(4(-1x+20))+36=0
We calculate terms in parentheses: -(4(-1x+20)), so:We get rid of parentheses
4(-1x+20)
We multiply parentheses
-4x+80
Back to the equation:
-(-4x+80)
4x-80+36=0
We add all the numbers together, and all the variables
4x-44=0
We move all terms containing x to the left, all other terms to the right
4x=44
x=44/4
x=11
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