42=49-y

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Solution for 42=49-y equation:


Simplifying
42 = 49 + -1y

Solving
42 = 49 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
42 + y = 49 + -1y + y

Combine like terms: -1y + y = 0
42 + y = 49 + 0
42 + y = 49

Add '-42' to each side of the equation.
42 + -42 + y = 49 + -42

Combine like terms: 42 + -42 = 0
0 + y = 49 + -42
y = 49 + -42

Combine like terms: 49 + -42 = 7
y = 7

Simplifying
y = 7

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