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5x-12=-6x+21
We move all terms to the left:
5x-12-(-6x+21)=0
We get rid of parentheses
5x+6x-21-12=0
We add all the numbers together, and all the variables
11x-33=0
We move all terms containing x to the left, all other terms to the right
11x=33
x=33/11
x=3
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