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X=7X-30
We move all terms to the left:
X-(7X-30)=0
We get rid of parentheses
X-7X+30=0
We add all the numbers together, and all the variables
-6X+30=0
We move all terms containing X to the left, all other terms to the right
-6X=-30
X=-30/-6
X=+5
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