400=40+0.90(y)

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Solution for 400=40+0.90(y) equation:


Simplifying
400 = 40 + 0.90(y)

Solving
400 = 40 + 0.90y

Solving for variable 'y'.

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

Add '-0.90y' to each side of the equation.
400 + -0.90y = 40 + 0.90y + -0.90y

Combine like terms: 0.90y + -0.90y = 0.00
400 + -0.90y = 40 + 0.00
400 + -0.90y = 40

Add '-400' to each side of the equation.
400 + -400 + -0.90y = 40 + -400

Combine like terms: 400 + -400 = 0
0 + -0.90y = 40 + -400
-0.90y = 40 + -400

Combine like terms: 40 + -400 = -360
-0.90y = -360

Divide each side by '-0.90'.
y = 400

Simplifying
y = 400

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