40=10-2y

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Solution for 40=10-2y equation: 


Simplifying
40 = 10 + -2y

Solving
40 = 10 + -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
40 + 2y = 10 + -2y + 2y

Combine like terms: -2y + 2y = 0
40 + 2y = 10 + 0
40 + 2y = 10

Add '-40' to each side of the equation.
40 + -40 + 2y = 10 + -40

Combine like terms: 40 + -40 = 0
0 + 2y = 10 + -40
2y = 10 + -40

Combine like terms: 10 + -40 = -30
2y = -30

Divide each side by '2'.
y = -15

Simplifying
y = -15

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