1-(y+2)=21

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Solution for 1-(y+2)=21 equation: 


Simplifying
1 + -1(y + 2) = 21

Reorder the terms:
1 + -1(2 + y) = 21
1 + (2 * -1 + y * -1) = 21
1 + (-2 + -1y) = 21

Combine like terms: 1 + -2 = -1
-1 + -1y = 21

Solving
-1 + -1y = 21

Solving for variable 'y'.

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

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

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

Combine like terms: 21 + 1 = 22
-1y = 22

Divide each side by '-1'.
y = -22

Simplifying
y = -22

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