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(X=X+4)20
We move all terms to the left:
(X-(X+4)20)=0
We calculate terms in parentheses: +(X-(X+4)20), so:We get rid of parentheses
X-(X+4)20
We multiply parentheses
X-20X-80
We add all the numbers together, and all the variables
-19X-80
Back to the equation:
+(-19X-80)
-19X-80=0
We move all terms containing X to the left, all other terms to the right
-19X=80
X=80/-19
X=-4+4/19
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