a-6+5a=3a-21

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Solution for a-6+5a=3a-21 equation:


Simplifying
a + -6 + 5a = 3a + -21

Reorder the terms:
-6 + a + 5a = 3a + -21

Combine like terms: a + 5a = 6a
-6 + 6a = 3a + -21

Reorder the terms:
-6 + 6a = -21 + 3a

Solving
-6 + 6a = -21 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
-6 + 6a + -3a = -21 + 3a + -3a

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

Combine like terms: 3a + -3a = 0
-6 + 3a = -21 + 0
-6 + 3a = -21

Add '6' to each side of the equation.
-6 + 6 + 3a = -21 + 6

Combine like terms: -6 + 6 = 0
0 + 3a = -21 + 6
3a = -21 + 6

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

Divide each side by '3'.
a = -5

Simplifying
a = -5

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