y-21=-4

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Solution for y-21=-4 equation: 


Simplifying
y + -21 = -4

Reorder the terms:
-21 + y = -4

Solving
-21 + y = -4

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 = -4 + 21

Combine like terms: -21 + 21 = 0
0 + y = -4 + 21
y = -4 + 21

Combine like terms: -4 + 21 = 17
y = 17

Simplifying
y = 17

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