4y-(y-4)=-21

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


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

Reorder the terms:
4y + -1(-4 + y) = -21
4y + (-4 * -1 + y * -1) = -21
4y + (4 + -1y) = -21

Reorder the terms:
4 + 4y + -1y = -21

Combine like terms: 4y + -1y = 3y
4 + 3y = -21

Solving
4 + 3y = -21

Solving for variable 'y'.

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

Add '-4' to each side of the equation.
4 + -4 + 3y = -21 + -4

Combine like terms: 4 + -4 = 0
0 + 3y = -21 + -4
3y = -21 + -4

Combine like terms: -21 + -4 = -25
3y = -25

Divide each side by '3'.
y = -8.333333333

Simplifying
y = -8.333333333

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