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30-7+(12+15/3)=x
We move all terms to the left:
30-7+(12+15/3)-(x)=0
We add all the numbers together, and all the variables
-x+30-7+17=0
We add all the numbers together, and all the variables
-1x+40=0
We move all terms containing x to the left, all other terms to the right
-x=-40
x=-40/-1
x=+40
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