21=18-y

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Solution for 21=18-y equation:


Simplifying
21 = 18 + -1y

Solving
21 = 18 + -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.
21 + y = 18 + -1y + y

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

Add '-21' to each side of the equation.
21 + -21 + y = 18 + -21

Combine like terms: 21 + -21 = 0
0 + y = 18 + -21
y = 18 + -21

Combine like terms: 18 + -21 = -3
y = -3

Simplifying
y = -3

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