5a-7.85=21

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Solution for 5a-7.85=21 equation: 


Simplifying
5a + -7.85 = 21

Reorder the terms:
-7.85 + 5a = 21

Solving
-7.85 + 5a = 21

Solving for variable 'a'.

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

Add '7.85' to each side of the equation.
-7.85 + 7.85 + 5a = 21 + 7.85

Combine like terms: -7.85 + 7.85 = 0.00
0.00 + 5a = 21 + 7.85
5a = 21 + 7.85

Combine like terms: 21 + 7.85 = 28.85
5a = 28.85

Divide each side by '5'.
a = 5.77

Simplifying
a = 5.77

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