9(a-1)-1=4(a+1)+1

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Solution for 9(a-1)-1=4(a+1)+1 equation: 



9(a-1)-1=4(a+1)+1

We move all terms to the left:

9(a-1)-1-(4(a+1)+1)=0

We multiply parentheses

9a-(4(a+1)+1)-9-1=0



We calculate terms in parentheses: -(4(a+1)+1), so:

4(a+1)+1

We multiply parentheses

4a+4+1

We add all the numbers together, and all the variables

4a+5

Back to the equation:

-(4a+5)



We add all the numbers together, and all the variables

9a-(4a+5)-10=0

We get rid of parentheses

9a-4a-5-10=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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