3a+10+13a=90

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Solution for 3a+10+13a=90 equation: 



3a+10+13a=90

We move all terms to the left:

3a+10+13a-(90)=0

We add all the numbers together, and all the variables

16a-80=0

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

16a=80

a=80/16

a=5

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