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4x+35x=21x+6
We move all terms to the left:
4x+35x-(21x+6)=0
We add all the numbers together, and all the variables
39x-(21x+6)=0
We get rid of parentheses
39x-21x-6=0
We add all the numbers together, and all the variables
18x-6=0
We move all terms containing x to the left, all other terms to the right
18x=6
x=6/18
x=1/3
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