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69=5x+6x+3
We move all terms to the left:
69-(5x+6x+3)=0
We add all the numbers together, and all the variables
-(11x+3)+69=0
We get rid of parentheses
-11x-3+69=0
We add all the numbers together, and all the variables
-11x+66=0
We move all terms containing x to the left, all other terms to the right
-11x=-66
x=-66/-11
x=+6
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