21=3(y-1)+y

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Solution for 21=3(y-1)+y equation:


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

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

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

Solving
21 = -3 + 4y

Solving for variable 'y'.

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

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

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

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

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

Combine like terms: -3 + -21 = -24
-4y = -24

Divide each side by '-4'.
y = 6

Simplifying
y = 6

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