A-3=(a-1)/2

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Solution for A-3=(a-1)/2 equation: 



-3=(A-1)/2

We move all terms to the left:

-3-((A-1)/2)=0

We multiply all the terms by the denominator


-((A-1)-3*2)=0



We calculate terms in parentheses: -((A-1)-3*2), so:

(A-1)-3*2

We add all the numbers together, and all the variables

(A-1)-6

We get rid of parentheses

A-1-6

We add all the numbers together, and all the variables

A-7

Back to the equation:

-(A-7)



We get rid of parentheses

-A+7=0

We add all the numbers together, and all the variables

-1A+7=0

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

-A=-7

A=-7/-1

A=+7

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