-4a+4+5a=12-21

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Solution for -4a+4+5a=12-21 equation:


Simplifying
-4a + 4 + 5a = 12 + -21

Reorder the terms:
4 + -4a + 5a = 12 + -21

Combine like terms: -4a + 5a = 1a
4 + 1a = 12 + -21

Combine like terms: 12 + -21 = -9
4 + 1a = -9

Solving
4 + 1a = -9

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 + 1a = -9 + -4

Combine like terms: 4 + -4 = 0
0 + 1a = -9 + -4
1a = -9 + -4

Combine like terms: -9 + -4 = -13
1a = -13

Divide each side by '1'.
a = -13

Simplifying
a = -13

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