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5x+12=4(2x-9)
We move all terms to the left:
5x+12-(4(2x-9))=0
We calculate terms in parentheses: -(4(2x-9)), so:We get rid of parentheses
4(2x-9)
We multiply parentheses
8x-36
Back to the equation:
-(8x-36)
5x-8x+36+12=0
We add all the numbers together, and all the variables
-3x+48=0
We move all terms containing x to the left, all other terms to the right
-3x=-48
x=-48/-3
x=+16
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