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28-16=4(x-9)
We move all terms to the left:
28-16-(4(x-9))=0
We add all the numbers together, and all the variables
-(4(x-9))+12=0
We calculate terms in parentheses: -(4(x-9)), so:We get rid of parentheses
4(x-9)
We multiply parentheses
4x-36
Back to the equation:
-(4x-36)
-4x+36+12=0
We add all the numbers together, and all the variables
-4x+48=0
We move all terms containing x to the left, all other terms to the right
-4x=-48
x=-48/-4
x=+12
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