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5(x+9)=4(2x-9)
We move all terms to the left:
5(x+9)-(4(2x-9))=0
We multiply parentheses
5x-(4(2x-9))+45=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+45=0
We add all the numbers together, and all the variables
-3x+81=0
We move all terms containing x to the left, all other terms to the right
-3x=-81
x=-81/-3
x=+27
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