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10x-21=-35-3x
We move all terms to the left:
10x-21-(-35-3x)=0
We add all the numbers together, and all the variables
10x-(-3x-35)-21=0
We get rid of parentheses
10x+3x+35-21=0
We add all the numbers together, and all the variables
13x+14=0
We move all terms containing x to the left, all other terms to the right
13x=-14
x=-14/13
x=-1+1/13
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