0.2y+0.8(25-y)=15.8

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Solution for 0.2y+0.8(25-y)=15.8 equation: 


Simplifying
0.2y + 0.8(25 + -1y) = 15.8
0.2y + (25 * 0.8 + -1y * 0.8) = 15.8
0.2y + (20 + -0.8y) = 15.8

Reorder the terms:
20 + 0.2y + -0.8y = 15.8

Combine like terms: 0.2y + -0.8y = -0.6y
20 + -0.6y = 15.8

Solving
20 + -0.6y = 15.8

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 + -0.6y = 15.8 + -20

Combine like terms: 20 + -20 = 0
0 + -0.6y = 15.8 + -20
-0.6y = 15.8 + -20

Combine like terms: 15.8 + -20 = -4.2
-0.6y = -4.2

Divide each side by '-0.6'.
y = 7

Simplifying
y = 7

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