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2(12x+3x)=3000
We move all terms to the left:
2(12x+3x)-(3000)=0
We add all the numbers together, and all the variables
2(+15x)-3000=0
We multiply parentheses
30x-3000=0
We move all terms containing x to the left, all other terms to the right
30x=3000
x=3000/30
x=100
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