3a(-5)-a(-1)=21

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Solution for 3a(-5)-a(-1)=21 equation: 



3a(-5)-a(-1)=21

We move all terms to the left:

3a(-5)-a(-1)-(21)=0

We multiply parentheses

-15a+1a-21=0

We add all the numbers together, and all the variables

-14a-21=0

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

-14a=21

a=21/-14

a=-1+1/2

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