x+x+0.5x=120

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Solution for x+x+0.5x=120 equation: 



x+x+0.5x=120

We move all terms to the left:

x+x+0.5x-(120)=0

We add all the numbers together, and all the variables

2.5x-120=0

We move all terms containing x to the left, all other terms to the right

2.5x=120

x=120/2.5

x=48

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