x+30+x=120

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Solution for x+30+x=120 equation: 



x+30+x=120

We move all terms to the left:

x+30+x-(120)=0

We add all the numbers together, and all the variables

2x-90=0

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

2x=90

x=90/2

x=45

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