10a+30+10a=90

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Solution for 10a+30+10a=90 equation: 



10a+30+10a=90

We move all terms to the left:

10a+30+10a-(90)=0

We add all the numbers together, and all the variables

20a-60=0

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

20a=60

a=60/20

a=3

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