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10+-5x=21-6x
We move all terms to the left:
10+-5x-(21-6x)=0
We add all the numbers together, and all the variables
-5x-(-6x+21)+10+=0
We add all the numbers together, and all the variables
-5x-(-6x+21)=0
We get rid of parentheses
-5x+6x-21=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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