42-y=39

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Solution for 42-y=39 equation:


Simplifying
42 + -1y = 39

Solving
42 + -1y = 39

Solving for variable 'y'.

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

Add '-42' to each side of the equation.
42 + -42 + -1y = 39 + -42

Combine like terms: 42 + -42 = 0
0 + -1y = 39 + -42
-1y = 39 + -42

Combine like terms: 39 + -42 = -3
-1y = -3

Divide each side by '-1'.
y = 3

Simplifying
y = 3

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