0.5=0.4y-0.25(90)

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Solution for 0.5=0.4y-0.25(90) equation: 


Simplifying
0.5 = 0.4y + -0.25(90)

Multiply -0.25 * 90
0.5 = 0.4y + -22.5

Reorder the terms:
0.5 = -22.5 + 0.4y

Solving
0.5 = -22.5 + 0.4y

Solving for variable 'y'.

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

Add '-0.4y' to each side of the equation.
0.5 + -0.4y = -22.5 + 0.4y + -0.4y

Combine like terms: 0.4y + -0.4y = 0.0
0.5 + -0.4y = -22.5 + 0.0
0.5 + -0.4y = -22.5

Add '-0.5' to each side of the equation.
0.5 + -0.5 + -0.4y = -22.5 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -0.4y = -22.5 + -0.5
-0.4y = -22.5 + -0.5

Combine like terms: -22.5 + -0.5 = -23
-0.4y = -23

Divide each side by '-0.4'.
y = 57.5

Simplifying
y = 57.5

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