x+40+x+40=90

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



x+40+x+40=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-10=0

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

2x=10

x=10/2

x=5

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