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4x+21-6x=10+2x-1
We move all terms to the left:
4x+21-6x-(10+2x-1)=0
We add all the numbers together, and all the variables
4x-6x-(2x+9)+21=0
We add all the numbers together, and all the variables
-2x-(2x+9)+21=0
We get rid of parentheses
-2x-2x-9+21=0
We add all the numbers together, and all the variables
-4x+12=0
We move all terms containing x to the left, all other terms to the right
-4x=-12
x=-12/-4
x=+3
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