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2x+3x-x=48+300
We move all terms to the left:
2x+3x-x-(48+300)=0
We add all the numbers together, and all the variables
2x+3x-x-348=0
We add all the numbers together, and all the variables
4x-348=0
We move all terms containing x to the left, all other terms to the right
4x=348
x=348/4
x=87
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