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4x+15=7x-18
We move all terms to the left:
4x+15-(7x-18)=0
We get rid of parentheses
4x-7x+18+15=0
We add all the numbers together, and all the variables
-3x+33=0
We move all terms containing x to the left, all other terms to the right
-3x=-33
x=-33/-3
x=+11
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