2(a-10)=90

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Solution for 2(a-10)=90 equation: 



2(a-10)=90

We move all terms to the left:

2(a-10)-(90)=0

We multiply parentheses

2a-20-90=0

We add all the numbers together, and all the variables

2a-110=0

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

2a=110

a=110/2

a=55

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