28-a+4a=

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Solution for 28-a+4a= equation: 


Simplifying
28 + -1a + 4a = 0

Combine like terms: -1a + 4a = 3a
28 + 3a = 0

Solving
28 + 3a = 0

Solving for variable 'a'.

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

Add '-28' to each side of the equation.
28 + -28 + 3a = 0 + -28

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

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

Divide each side by '3'.
a = -9.333333333

Simplifying
a = -9.333333333

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