30+10x+20=90

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Solution for 30+10x+20=90 equation: 



30+10x+20=90

We move all terms to the left:

30+10x+20-(90)=0

We add all the numbers together, and all the variables

10x-40=0

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

10x=40

x=40/10

x=4

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