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-4x-2=-13x+21
We move all terms to the left:
-4x-2-(-13x+21)=0
We get rid of parentheses
-4x+13x-21-2=0
We add all the numbers together, and all the variables
9x-23=0
We move all terms containing x to the left, all other terms to the right
9x=23
x=23/9
x=2+5/9
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