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X+(X+4)=580
We move all terms to the left:
X+(X+4)-(580)=0
We get rid of parentheses
X+X+4-580=0
We add all the numbers together, and all the variables
2X-576=0
We move all terms containing X to the left, all other terms to the right
2X=576
X=576/2
X=288
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