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2x-15=-7x-9
We move all terms to the left:
2x-15-(-7x-9)=0
We get rid of parentheses
2x+7x+9-15=0
We add all the numbers together, and all the variables
9x-6=0
We move all terms containing x to the left, all other terms to the right
9x=6
x=6/9
x=2/3
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