20+(-0.8y)+4y=100

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Solution for 20+(-0.8y)+4y=100 equation: 


Simplifying
20 + (-0.8y) + 4y = 100

Combine like terms: (-0.8y) + 4y = 3.2y
20 + 3.2y = 100

Solving
20 + 3.2y = 100

Solving for variable 'y'.

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

Add '-20' to each side of the equation.
20 + -20 + 3.2y = 100 + -20

Combine like terms: 20 + -20 = 0
0 + 3.2y = 100 + -20
3.2y = 100 + -20

Combine like terms: 100 + -20 = 80
3.2y = 80

Divide each side by '3.2'.
y = 25

Simplifying
y = 25

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