21=y-(-6)

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Solution for 21=y-(-6) equation:


Simplifying
21 = y + -1(-6)

Multiply -1 * -6
21 = y + 6

Reorder the terms:
21 = 6 + y

Solving
21 = 6 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
21 + -1y = 6 + y + -1y

Combine like terms: y + -1y = 0
21 + -1y = 6 + 0
21 + -1y = 6

Add '-21' to each side of the equation.
21 + -21 + -1y = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -1y = 6 + -21
-1y = 6 + -21

Combine like terms: 6 + -21 = -15
-1y = -15

Divide each side by '-1'.
y = 15

Simplifying
y = 15

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