18=2(a-1)

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Solution for 18=2(a-1) equation: 



18=2(a-1)

We move all terms to the left:

18-(2(a-1))=0



We calculate terms in parentheses: -(2(a-1)), so:

2(a-1)

We multiply parentheses

2a-2

Back to the equation:

-(2a-2)



We get rid of parentheses

-2a+2+18=0

We add all the numbers together, and all the variables

-2a+20=0

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

-2a=-20

a=-20/-2

a=+10

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