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4x+21=6x+35
We move all terms to the left:
4x+21-(6x+35)=0
We get rid of parentheses
4x-6x-35+21=0
We add all the numbers together, and all the variables
-2x-14=0
We move all terms containing x to the left, all other terms to the right
-2x=14
x=14/-2
x=-7
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