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54=6x+4(3x-9)
We move all terms to the left:
54-(6x+4(3x-9))=0
We calculate terms in parentheses: -(6x+4(3x-9)), so:We get rid of parentheses
6x+4(3x-9)
We multiply parentheses
6x+12x-36
We add all the numbers together, and all the variables
18x-36
Back to the equation:
-(18x-36)
-18x+36+54=0
We add all the numbers together, and all the variables
-18x+90=0
We move all terms containing x to the left, all other terms to the right
-18x=-90
x=-90/-18
x=+5
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