(Y*0.8)+(X*0.2)=90

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Solution for (Y*0.8)+(X*0.2)=90 equation: 


Simplifying
(Y * 0.8) + (X * 0.2) = 90

Reorder the terms for easier multiplication:
(0.8Y) + (X * 0.2) = 90

Reorder the terms for easier multiplication:
(0.8Y) + (0.2X) = 90

Reorder the terms:
(0.2X) + (0.8Y) = 90

Solving
(0.2X) + (0.8Y) = 90

Solving for variable 'X'.

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

Add '(-0.8Y)' to each side of the equation.
(0.2X) + (0.8Y) + (-0.8Y) = 90 + (-0.8Y)

Combine like terms: (0.8Y) + (-0.8Y) = 0.0
(0.2X) + 0.0 = 90 + (-0.8Y)
(0.2X) = 90 + (-0.8Y)

Divide each side by '0.2'.
X = 450 + (-4Y)

Simplifying
X = 450 + (-4Y)

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