18=-3y+21

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Solution for 18=-3y+21 equation:


Simplifying
18 = -3y + 21

Reorder the terms:
18 = 21 + -3y

Solving
18 = 21 + -3y

Solving for variable 'y'.

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

Add '3y' to each side of the equation.
18 + 3y = 21 + -3y + 3y

Combine like terms: -3y + 3y = 0
18 + 3y = 21 + 0
18 + 3y = 21

Add '-18' to each side of the equation.
18 + -18 + 3y = 21 + -18

Combine like terms: 18 + -18 = 0
0 + 3y = 21 + -18
3y = 21 + -18

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

Divide each side by '3'.
y = 1

Simplifying
y = 1

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