-4(a+1)-5(a+1)=-18

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Solution for -4(a+1)-5(a+1)=-18 equation: 



-4(a+1)-5(a+1)=-18

We move all terms to the left:

-4(a+1)-5(a+1)-(-18)=0

We add all the numbers together, and all the variables

-4(a+1)-5(a+1)+18=0

We multiply parentheses

-4a-5a-4-5+18=0

We add all the numbers together, and all the variables

-9a+9=0

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

-9a=-9

a=-9/-9

a=1

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