0.20(120-y)+0.75y=7.20

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Solution for 0.20(120-y)+0.75y=7.20 equation: 


Simplifying
0.20(120 + -1y) + 0.75y = 7.20
(120 * 0.20 + -1y * 0.20) + 0.75y = 7.20
(24 + -0.2y) + 0.75y = 7.20

Combine like terms: -0.2y + 0.75y = 0.55y
24 + 0.55y = 7.20

Solving
24 + 0.55y = 7.20

Solving for variable 'y'.

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

Add '-24' to each side of the equation.
24 + -24 + 0.55y = 7.20 + -24

Combine like terms: 24 + -24 = 0
0 + 0.55y = 7.20 + -24
0.55y = 7.20 + -24

Combine like terms: 7.20 + -24 = -16.8
0.55y = -16.8

Divide each side by '0.55'.
y = -30.54545455

Simplifying
y = -30.54545455

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