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-21-6x=-1-4x
We move all terms to the left:
-21-6x-(-1-4x)=0
We add all the numbers together, and all the variables
-6x-(-4x-1)-21=0
We get rid of parentheses
-6x+4x+1-21=0
We add all the numbers together, and all the variables
-2x-20=0
We move all terms containing x to the left, all other terms to the right
-2x=20
x=20/-2
x=-10
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