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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