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54=2(4x+5x)
We move all terms to the left:
54-(2(4x+5x))=0
We add all the numbers together, and all the variables
-(2(+9x))+54=0
We calculate terms in parentheses: -(2(+9x)), so:We move all terms containing x to the left, all other terms to the right
2(+9x)
We multiply parentheses
18x
Back to the equation:
-(18x)
-18x=-54
x=-54/-18
x=+3
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