x-20+x-20=90

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



x-20+x-20=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-130=0

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

2x=130

x=130/2

x=65

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