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X+19+5X=21+2X
We move all terms to the left:
X+19+5X-(21+2X)=0
We add all the numbers together, and all the variables
X+5X-(2X+21)+19=0
We add all the numbers together, and all the variables
6X-(2X+21)+19=0
We get rid of parentheses
6X-2X-21+19=0
We add all the numbers together, and all the variables
4X-2=0
We move all terms containing X to the left, all other terms to the right
4X=2
X=2/4
X=1/2
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