90+x+4x=120

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Solution for 90+x+4x=120 equation: 



90+x+4x=120

We move all terms to the left:

90+x+4x-(120)=0

We add all the numbers together, and all the variables

5x-30=0

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

5x=30

x=30/5

x=6

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