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2x+3(2x-9)=13
We move all terms to the left:
2x+3(2x-9)-(13)=0
We multiply parentheses
2x+6x-27-13=0
We add all the numbers together, and all the variables
8x-40=0
We move all terms containing x to the left, all other terms to the right
8x=40
x=40/8
x=5
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