8+5a-2a=21

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Solution for 8+5a-2a=21 equation: 


Simplifying
8 + 5a + -2a = 21

Combine like terms: 5a + -2a = 3a
8 + 3a = 21

Solving
8 + 3a = 21

Solving for variable 'a'.

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

Add '-8' to each side of the equation.
8 + -8 + 3a = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 3a = 21 + -8
3a = 21 + -8

Combine like terms: 21 + -8 = 13
3a = 13

Divide each side by '3'.
a = 4.333333333

Simplifying
a = 4.333333333

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