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2x+2(2x-9)=54
We move all terms to the left:
2x+2(2x-9)-(54)=0
We multiply parentheses
2x+4x-18-54=0
We add all the numbers together, and all the variables
6x-72=0
We move all terms containing x to the left, all other terms to the right
6x=72
x=72/6
x=12
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