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-1=-4+21x
We move all terms to the left:
-1-(-4+21x)=0
We add all the numbers together, and all the variables
-(21x-4)-1=0
We get rid of parentheses
-21x+4-1=0
We add all the numbers together, and all the variables
-21x+3=0
We move all terms containing x to the left, all other terms to the right
-21x=-3
x=-3/-21
x=1/7
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