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4x+21=6x+17
We move all terms to the left:
4x+21-(6x+17)=0
We get rid of parentheses
4x-6x-17+21=0
We add all the numbers together, and all the variables
-2x+4=0
We move all terms containing x to the left, all other terms to the right
-2x=-4
x=-4/-2
x=+2
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