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 = -63
y = -63

Simplifying
y = -63

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