84=a(.21)

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Solution for 84=a(.21) equation:


Simplifying
84 = a(0.21)

Reorder the terms for easier multiplication:
84 = 0.21a

Solving
84 = 0.21a

Solving for variable 'a'.

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

Add '-0.21a' to each side of the equation.
84 + -0.21a = 0.21a + -0.21a

Combine like terms: 0.21a + -0.21a = 0.00
84 + -0.21a = 0.00

Add '-84' to each side of the equation.
84 + -84 + -0.21a = 0.00 + -84

Combine like terms: 84 + -84 = 0
0 + -0.21a = 0.00 + -84
-0.21a = 0.00 + -84

Combine like terms: 0.00 + -84 = -84
-0.21a = -84

Divide each side by '-0.21'.
a = 400

Simplifying
a = 400

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