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X=7.5+2X
We move all terms to the left:
X-(7.5+2X)=0
We add all the numbers together, and all the variables
X-(2X+7.5)=0
We get rid of parentheses
X-2X-7.5=0
We add all the numbers together, and all the variables
-1X-7.5=0
We move all terms containing X to the left, all other terms to the right
-X=7.5
X=7.5/-1
X=-7+0.5/1
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