.55(200-y)+.75y=128.8

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Solution for .55(200-y)+.75y=128.8 equation: 


Simplifying
0.55(200 + -1y) + 0.75y = 128.8
(200 * 0.55 + -1y * 0.55) + 0.75y = 128.8
(110 + -0.55y) + 0.75y = 128.8

Combine like terms: -0.55y + 0.75y = 0.2y
110 + 0.2y = 128.8

Solving
110 + 0.2y = 128.8

Solving for variable 'y'.

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

Add '-110' to each side of the equation.
110 + -110 + 0.2y = 128.8 + -110

Combine like terms: 110 + -110 = 0
0 + 0.2y = 128.8 + -110
0.2y = 128.8 + -110

Combine like terms: 128.8 + -110 = 18.8
0.2y = 18.8

Divide each side by '0.2'.
y = 94

Simplifying
y = 94

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