21+21+42+y=

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Solution for 21+21+42+y= equation: 


Simplifying
21 + 21 + 42 + y = 0

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

Combine like terms: 42 + 42 = 84
84 + y = 0

Solving
84 + y = 0

Solving for variable 'y'.

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

Add '-84' to each side of the equation.
84 + -84 + y = 0 + -84

Combine like terms: 84 + -84 = 0
0 + y = 0 + -84
y = 0 + -84

Combine like terms: 0 + -84 = -84
y = -84

Simplifying
y = -84

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