8a+4=21

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Solution for 8a+4=21 equation: 


Simplifying
8a + 4 = 21

Reorder the terms:
4 + 8a = 21

Solving
4 + 8a = 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 + 8a = 21 + -4

Combine like terms: 4 + -4 = 0
0 + 8a = 21 + -4
8a = 21 + -4

Combine like terms: 21 + -4 = 17
8a = 17

Divide each side by '8'.
a = 2.125

Simplifying
a = 2.125

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