164=0.8(220-y)

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Solution for 164=0.8(220-y) equation:


Simplifying
164 = 0.8(220 + -1y)
164 = (220 * 0.8 + -1y * 0.8)
164 = (176 + -0.8y)

Solving
164 = 176 + -0.8y

Solving for variable 'y'.

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

Add '0.8y' to each side of the equation.
164 + 0.8y = 176 + -0.8y + 0.8y

Combine like terms: -0.8y + 0.8y = 0.0
164 + 0.8y = 176 + 0.0
164 + 0.8y = 176

Add '-164' to each side of the equation.
164 + -164 + 0.8y = 176 + -164

Combine like terms: 164 + -164 = 0
0 + 0.8y = 176 + -164
0.8y = 176 + -164

Combine like terms: 176 + -164 = 12
0.8y = 12

Divide each side by '0.8'.
y = 15

Simplifying
y = 15

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