21-4y=-18

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Solution for 21-4y=-18 equation: 


Simplifying
21 + -4y = -18

Solving
21 + -4y = -18

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + -4y = -18 + -21

Combine like terms: 21 + -21 = 0
0 + -4y = -18 + -21
-4y = -18 + -21

Combine like terms: -18 + -21 = -39
-4y = -39

Divide each side by '-4'.
y = 9.75

Simplifying
y = 9.75

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