8a-3a-4=21

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Solution for 8a-3a-4=21 equation: 


Simplifying
8a + -3a + -4 = 21

Reorder the terms:
-4 + 8a + -3a = 21

Combine like terms: 8a + -3a = 5a
-4 + 5a = 21

Solving
-4 + 5a = 21

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + 5a = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5a = 21 + 4
5a = 21 + 4

Combine like terms: 21 + 4 = 25
5a = 25

Divide each side by '5'.
a = 5

Simplifying
a = 5

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