21-(-4)y=5

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Solution for 21-(-4)y=5 equation: 


Simplifying
21 + -1(-4) * y = 5

Multiply -1 * -4
21 + 4y = 5

Solving
21 + 4y = 5

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 + 4y = 5 + -21

Combine like terms: 21 + -21 = 0
0 + 4y = 5 + -21
4y = 5 + -21

Combine like terms: 5 + -21 = -16
4y = -16

Divide each side by '4'.
y = -4

Simplifying
y = -4

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