-21+3a=9a-15

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Solution for -21+3a=9a-15 equation:


Simplifying
-21 + 3a = 9a + -15

Reorder the terms:
-21 + 3a = -15 + 9a

Solving
-21 + 3a = -15 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
-21 + 3a + -9a = -15 + 9a + -9a

Combine like terms: 3a + -9a = -6a
-21 + -6a = -15 + 9a + -9a

Combine like terms: 9a + -9a = 0
-21 + -6a = -15 + 0
-21 + -6a = -15

Add '21' to each side of the equation.
-21 + 21 + -6a = -15 + 21

Combine like terms: -21 + 21 = 0
0 + -6a = -15 + 21
-6a = -15 + 21

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

Divide each side by '-6'.
a = -1

Simplifying
a = -1

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