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X-43=20+4X
We move all terms to the left:
X-43-(20+4X)=0
We add all the numbers together, and all the variables
X-(4X+20)-43=0
We get rid of parentheses
X-4X-20-43=0
We add all the numbers together, and all the variables
-3X-63=0
We move all terms containing X to the left, all other terms to the right
-3X=63
X=63/-3
X=-21
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