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-2x+6=5x-21
We move all terms to the left:
-2x+6-(5x-21)=0
We get rid of parentheses
-2x-5x+21+6=0
We add all the numbers together, and all the variables
-7x+27=0
We move all terms containing x to the left, all other terms to the right
-7x=-27
x=-27/-7
x=3+6/7
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