y-(-21)=42

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Solution for y-(-21)=42 equation: 


Simplifying
y + -1(-21) = 42

Multiply -1 * -21
y + 21 = 42

Reorder the terms:
21 + y = 42

Solving
21 + y = 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 + y = 42 + -21

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

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

Simplifying
y = 21

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