5(a+2)=90

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Solution for 5(a+2)=90 equation: 



5(a+2)=90

We move all terms to the left:

5(a+2)-(90)=0

We multiply parentheses

5a+10-90=0

We add all the numbers together, and all the variables

5a-80=0

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

5a=80

a=80/5

a=16

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