20+x+x=90

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Solution for 20+x+x=90 equation: 



20+x+x=90

We move all terms to the left:

20+x+x-(90)=0

We add all the numbers together, and all the variables

2x-70=0

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

2x=70

x=70/2

x=35

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