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30-12/(2+4)=x
We move all terms to the left:
30-12/(2+4)-(x)=0
We add all the numbers together, and all the variables
-x+30-12/6=0
We add all the numbers together, and all the variables
-1x+28=0
We move all terms containing x to the left, all other terms to the right
-x=-28
x=-28/-1
x=+28
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