9a+4-a=28

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Solution for 9a+4-a=28 equation:


Simplifying
9a + 4 + -1a = 28

Reorder the terms:
4 + 9a + -1a = 28

Combine like terms: 9a + -1a = 8a
4 + 8a = 28

Solving
4 + 8a = 28

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + 8a = 28 + -4

Combine like terms: 4 + -4 = 0
0 + 8a = 28 + -4
8a = 28 + -4

Combine like terms: 28 + -4 = 24
8a = 24

Divide each side by '8'.
a = 3

Simplifying
a = 3

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