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150x+3000=120x-3000
We move all terms to the left:
150x+3000-(120x-3000)=0
We get rid of parentheses
150x-120x+3000+3000=0
We add all the numbers together, and all the variables
30x+6000=0
We move all terms containing x to the left, all other terms to the right
30x=-6000
x=-6000/30
x=-200
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