20=15-y

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Solution for 20=15-y equation:


Simplifying
20 = 15 + -1y

Solving
20 = 15 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
20 + y = 15 + -1y + y

Combine like terms: -1y + y = 0
20 + y = 15 + 0
20 + y = 15

Add '-20' to each side of the equation.
20 + -20 + y = 15 + -20

Combine like terms: 20 + -20 = 0
0 + y = 15 + -20
y = 15 + -20

Combine like terms: 15 + -20 = -5
y = -5

Simplifying
y = -5

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