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6x+21=13x-35x=
We move all terms to the left:
6x+21-(13x-35x)=0
We add all the numbers together, and all the variables
6x-(-22x)+21=0
We get rid of parentheses
6x+22x+21=0
We add all the numbers together, and all the variables
28x+21=0
We move all terms containing x to the left, all other terms to the right
28x=-21
x=-21/28
x=-3/4
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