21-8a=-5(a+6)

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Solution for 21-8a=-5(a+6) equation:


Simplifying
21 + -8a = -5(a + 6)

Reorder the terms:
21 + -8a = -5(6 + a)
21 + -8a = (6 * -5 + a * -5)
21 + -8a = (-30 + -5a)

Solving
21 + -8a = -30 + -5a

Solving for variable 'a'.

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

Add '5a' to each side of the equation.
21 + -8a + 5a = -30 + -5a + 5a

Combine like terms: -8a + 5a = -3a
21 + -3a = -30 + -5a + 5a

Combine like terms: -5a + 5a = 0
21 + -3a = -30 + 0
21 + -3a = -30

Add '-21' to each side of the equation.
21 + -21 + -3a = -30 + -21

Combine like terms: 21 + -21 = 0
0 + -3a = -30 + -21
-3a = -30 + -21

Combine like terms: -30 + -21 = -51
-3a = -51

Divide each side by '-3'.
a = 17

Simplifying
a = 17

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