3y-21=-42

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Solution for 3y-21=-42 equation: 


Simplifying
3y + -21 = -42

Reorder the terms:
-21 + 3y = -42

Solving
-21 + 3y = -42

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 + 3y = -42 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = -42 + 21
3y = -42 + 21

Combine like terms: -42 + 21 = -21
3y = -21

Divide each side by '3'.
y = -7

Simplifying
y = -7

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