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144=4(9-x)
We move all terms to the left:
144-(4(9-x))=0
We add all the numbers together, and all the variables
-(4(-1x+9))+144=0
We calculate terms in parentheses: -(4(-1x+9)), so:We get rid of parentheses
4(-1x+9)
We multiply parentheses
-4x+36
Back to the equation:
-(-4x+36)
4x-36+144=0
We add all the numbers together, and all the variables
4x+108=0
We move all terms containing x to the left, all other terms to the right
4x=-108
x=-108/4
x=-27
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