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21x-56=6x+3
We move all terms to the left:
21x-56-(6x+3)=0
We get rid of parentheses
21x-6x-3-56=0
We add all the numbers together, and all the variables
15x-59=0
We move all terms containing x to the left, all other terms to the right
15x=59
x=59/15
x=3+14/15
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