0.9(220-a)=178.2

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Solution for 0.9(220-a)=178.2 equation: 


Simplifying
0.9(220 + -1a) = 178.2
(220 * 0.9 + -1a * 0.9) = 178.2
(198 + -0.9a) = 178.2

Solving
198 + -0.9a = 178.2

Solving for variable 'a'.

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

Add '-198' to each side of the equation.
198 + -198 + -0.9a = 178.2 + -198

Combine like terms: 198 + -198 = 0
0 + -0.9a = 178.2 + -198
-0.9a = 178.2 + -198

Combine like terms: 178.2 + -198 = -19.8
-0.9a = -19.8

Divide each side by '-0.9'.
a = 22

Simplifying
a = 22

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