20=.8(200-a)

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Solution for 20=.8(200-a) equation:


Simplifying
20 = 0.8(200 + -1a)
20 = (200 * 0.8 + -1a * 0.8)
20 = (160 + -0.8a)

Solving
20 = 160 + -0.8a

Solving for variable 'a'.

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

Add '0.8a' to each side of the equation.
20 + 0.8a = 160 + -0.8a + 0.8a

Combine like terms: -0.8a + 0.8a = 0.0
20 + 0.8a = 160 + 0.0
20 + 0.8a = 160

Add '-20' to each side of the equation.
20 + -20 + 0.8a = 160 + -20

Combine like terms: 20 + -20 = 0
0 + 0.8a = 160 + -20
0.8a = 160 + -20

Combine like terms: 160 + -20 = 140
0.8a = 140

Divide each side by '0.8'.
a = 175

Simplifying
a = 175

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