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4x-x-8x=-10x+21
We move all terms to the left:
4x-x-8x-(-10x+21)=0
We add all the numbers together, and all the variables
-5x-(-10x+21)=0
We get rid of parentheses
-5x+10x-21=0
We add all the numbers together, and all the variables
5x-21=0
We move all terms containing x to the left, all other terms to the right
5x=21
x=21/5
x=4+1/5
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