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