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