18+x+x=90

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Solution for 18+x+x=90 equation: 



18+x+x=90

We move all terms to the left:

18+x+x-(90)=0

We add all the numbers together, and all the variables

2x-72=0

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

2x=72

x=72/2

x=36

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