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-66=-5x+x+6
We move all terms to the left:
-66-(-5x+x+6)=0
We add all the numbers together, and all the variables
-(-4x+6)-66=0
We get rid of parentheses
4x-6-66=0
We add all the numbers together, and all the variables
4x-72=0
We move all terms containing x to the left, all other terms to the right
4x=72
x=72/4
x=18
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