8x+x=30+20+40

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Solution for 8x+x=30+20+40 equation: 



8x+x=30+20+40

We move all terms to the left:

8x+x-(30+20+40)=0

We add all the numbers together, and all the variables

8x+x-90=0

We add all the numbers together, and all the variables

9x-90=0

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

9x=90

x=90/9

x=10

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