x+40+x+20=90

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



x+40+x+20=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-30=0

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

2x=30

x=30/2

x=15

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