21=-(y-3)+4y

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Solution for 21=-(y-3)+4y equation:


Simplifying
21 = -1(y + -3) + 4y

Reorder the terms:
21 = -1(-3 + y) + 4y
21 = (-3 * -1 + y * -1) + 4y
21 = (3 + -1y) + 4y

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

Solving
21 = 3 + 3y

Solving for variable 'y'.

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

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

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

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

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

Combine like terms: 3 + -21 = -18
-3y = -18

Divide each side by '-3'.
y = 6

Simplifying
y = 6

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