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x+7=3x+30
We move all terms to the left:
x+7-(3x+30)=0
We get rid of parentheses
x-3x-30+7=0
We add all the numbers together, and all the variables
-2x-23=0
We move all terms containing x to the left, all other terms to the right
-2x=23
x=23/-2
x=-11+1/2
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