3a-13=-28;-6,-5,-4

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Solution for 3a-13=-28;-6,-5,-4 equation: 



3a-13=-28-6.-5.-4

We move all terms to the left:

3a-13-(-28-6.-5.-4)=0

We add all the numbers together, and all the variables

3a-13-(-43)=0

We add all the numbers together, and all the variables

3a+30=0

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

3a=-30

a=-30/3

a=-10

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