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2(5x+9)=7x-9
We move all terms to the left:
2(5x+9)-(7x-9)=0
We multiply parentheses
10x-(7x-9)+18=0
We get rid of parentheses
10x-7x+9+18=0
We add all the numbers together, and all the variables
3x+27=0
We move all terms containing x to the left, all other terms to the right
3x=-27
x=-27/3
x=-9
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