21-8a=-5a+30

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Solution for 21-8a=-5a+30 equation:


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

Reorder the terms:
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 = 9
-3a = 9

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

Simplifying
a = -3

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