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12x=300-4x
We move all terms to the left:
12x-(300-4x)=0
We add all the numbers together, and all the variables
12x-(-4x+300)=0
We get rid of parentheses
12x+4x-300=0
We add all the numbers together, and all the variables
16x-300=0
We move all terms containing x to the left, all other terms to the right
16x=300
x=300/16
x=18+3/4
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