2+a.4=-1

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Solution for 2+a.4=-1 equation: 



2+a.4=-1

We move all terms to the left:

2+a.4-(-1)=0

We add all the numbers together, and all the variables

a.4+3=0

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

a.4=-3

a=-3/1

a=-3

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