2x+x+3x=90

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Solution for 2x+x+3x=90 equation: 



2x+x+3x=90

We move all terms to the left:

2x+x+3x-(90)=0

We add all the numbers together, and all the variables

6x-90=0

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

6x=90

x=90/6

x=15

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