-21=9a-15-13a

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Solution for -21=9a-15-13a equation:


Simplifying
-21 = 9a + -15 + -13a

Reorder the terms:
-21 = -15 + 9a + -13a

Combine like terms: 9a + -13a = -4a
-21 = -15 + -4a

Solving
-21 = -15 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
-21 + 4a = -15 + -4a + 4a

Combine like terms: -4a + 4a = 0
-21 + 4a = -15 + 0
-21 + 4a = -15

Add '21' to each side of the equation.
-21 + 21 + 4a = -15 + 21

Combine like terms: -21 + 21 = 0
0 + 4a = -15 + 21
4a = -15 + 21

Combine like terms: -15 + 21 = 6
4a = 6

Divide each side by '4'.
a = 1.5

Simplifying
a = 1.5

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