28-a+4a=7

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Solution for 28-a+4a=7 equation: 


Simplifying
28 + -1a + 4a = 7

Combine like terms: -1a + 4a = 3a
28 + 3a = 7

Solving
28 + 3a = 7

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 = 7 + -28

Combine like terms: 28 + -28 = 0
0 + 3a = 7 + -28
3a = 7 + -28

Combine like terms: 7 + -28 = -21
3a = -21

Divide each side by '3'.
a = -7

Simplifying
a = -7

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