30-y=42

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Solution for 30-y=42 equation: 


Simplifying
30 + -1y = 42

Solving
30 + -1y = 42

Solving for variable 'y'.

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

Add '-30' to each side of the equation.
30 + -30 + -1y = 42 + -30

Combine like terms: 30 + -30 = 0
0 + -1y = 42 + -30
-1y = 42 + -30

Combine like terms: 42 + -30 = 12
-1y = 12

Divide each side by '-1'.
y = -12

Simplifying
y = -12

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