10+x+2x+x=90

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Solution for 10+x+2x+x=90 equation: 



10+x+2x+x=90

We move all terms to the left:

10+x+2x+x-(90)=0

We add all the numbers together, and all the variables

4x-80=0

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

4x=80

x=80/4

x=20

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