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5x+2(2x-9)=18
We move all terms to the left:
5x+2(2x-9)-(18)=0
We multiply parentheses
5x+4x-18-18=0
We add all the numbers together, and all the variables
9x-36=0
We move all terms containing x to the left, all other terms to the right
9x=36
x=36/9
x=4
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