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2+7=5x+15
We move all terms to the left:
2+7-(5x+15)=0
We add all the numbers together, and all the variables
-(5x+15)+9=0
We get rid of parentheses
-5x-15+9=0
We add all the numbers together, and all the variables
-5x-6=0
We move all terms containing x to the left, all other terms to the right
-5x=6
x=6/-5
x=-1+1/5
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