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13x-15=9x+18
We move all terms to the left:
13x-15-(9x+18)=0
We get rid of parentheses
13x-9x-18-15=0
We add all the numbers together, and all the variables
4x-33=0
We move all terms containing x to the left, all other terms to the right
4x=33
x=33/4
x=8+1/4
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