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69=3x+18
We move all terms to the left:
69-(3x+18)=0
We get rid of parentheses
-3x-18+69=0
We add all the numbers together, and all the variables
-3x+51=0
We move all terms containing x to the left, all other terms to the right
-3x=-51
x=-51/-3
x=+17
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