18-2a=a-72

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Solution for 18-2a=a-72 equation: 



18-2a=a-72

We move all terms to the left:

18-2a-(a-72)=0

We get rid of parentheses

-2a-a+72+18=0

We add all the numbers together, and all the variables

-3a+90=0

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

-3a=-90

a=-90/-3

a=+30

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