18=15-y

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Solution for 18=15-y equation:


Simplifying
18 = 15 + -1y

Solving
18 = 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.
18 + y = 15 + -1y + y

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

Add '-18' to each side of the equation.
18 + -18 + y = 15 + -18

Combine like terms: 18 + -18 = 0
0 + y = 15 + -18
y = 15 + -18

Combine like terms: 15 + -18 = -3
y = -3

Simplifying
y = -3

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