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