5x-8+x+20=90

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Solution for 5x-8+x+20=90 equation: 



5x-8+x+20=90

We move all terms to the left:

5x-8+x+20-(90)=0

We add all the numbers together, and all the variables

6x-78=0

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

6x=78

x=78/6

x=13

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