3+a(-4)=31

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Solution for 3+a(-4)=31 equation: 



3+a(-4)=31

We move all terms to the left:

3+a(-4)-(31)=0

We add all the numbers together, and all the variables

a(-4)-28=0

We multiply parentheses

-4a-28=0

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

-4a=28

a=28/-4

a=-7

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