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40X-(12000+10X)=30000
We move all terms to the left:
40X-(12000+10X)-(30000)=0
We add all the numbers together, and all the variables
40X-(10X+12000)-30000=0
We get rid of parentheses
40X-10X-12000-30000=0
We add all the numbers together, and all the variables
30X-42000=0
We move all terms containing X to the left, all other terms to the right
30X=42000
X=42000/30
X=1400
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