x+x+x+20+x+20+2x-70+90=720

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Solution for x+x+x+20+x+20+2x-70+90=720 equation: 



x+x+x+20+x+20+2x-70+90=720

We move all terms to the left:

x+x+x+20+x+20+2x-70+90-(720)=0

We add all the numbers together, and all the variables

6x-660=0

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

6x=660

x=660/6

x=110

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