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66=15x+7x
We move all terms to the left:
66-(15x+7x)=0
We add all the numbers together, and all the variables
-(+22x)+66=0
We get rid of parentheses
-22x+66=0
We move all terms containing x to the left, all other terms to the right
-22x=-66
x=-66/-22
x=+3
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