3a-13=-28

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Solution for 3a-13=-28 equation: 


Simplifying
3a + -13 = -28

Reorder the terms:
-13 + 3a = -28

Solving
-13 + 3a = -28

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '13' to each side of the equation.
-13 + 13 + 3a = -28 + 13

Combine like terms: -13 + 13 = 0
0 + 3a = -28 + 13
3a = -28 + 13

Combine like terms: -28 + 13 = -15
3a = -15

Divide each side by '3'.
a = -5

Simplifying
a = -5

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