a-4.2=16.8

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Solution for a-4.2=16.8 equation: 


Simplifying
a + -4.2 = 16.8

Reorder the terms:
-4.2 + a = 16.8

Solving
-4.2 + a = 16.8

Solving for variable 'a'.

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

Add '4.2' to each side of the equation.
-4.2 + 4.2 + a = 16.8 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + a = 16.8 + 4.2
a = 16.8 + 4.2

Combine like terms: 16.8 + 4.2 = 21
a = 21

Simplifying
a = 21

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