1a-2(180-7a)=90

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Solution for 1a-2(180-7a)=90 equation: 



1a-2(180-7a)=90

We move all terms to the left:

1a-2(180-7a)-(90)=0

We add all the numbers together, and all the variables

1a-2(-7a+180)-90=0

We add all the numbers together, and all the variables

a-2(-7a+180)-90=0

We multiply parentheses

a+14a-360-90=0

We add all the numbers together, and all the variables

15a-450=0

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

15a=450

a=450/15

a=30

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