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X+19=4X-20
We move all terms to the left:
X+19-(4X-20)=0
We get rid of parentheses
X-4X+20+19=0
We add all the numbers together, and all the variables
-3X+39=0
We move all terms containing X to the left, all other terms to the right
-3X=-39
X=-39/-3
X=+13
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