-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 = 39
-3y = 39

Divide each side by '-3'.
y = -13

Simplifying
y = -13

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