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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+24=0
We move all terms containing x to the left, all other terms to the right
-7x=-24
x=-24/-7
x=3+3/7
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