2x+20+x+40=90

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Solution for 2x+20+x+40=90 equation: 



2x+20+x+40=90

We move all terms to the left:

2x+20+x+40-(90)=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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