21=7-(3y-2)

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Solution for 21=7-(3y-2) equation:


Simplifying
21 = 7 + -1(3y + -2)

Reorder the terms:
21 = 7 + -1(-2 + 3y)
21 = 7 + (-2 * -1 + 3y * -1)
21 = 7 + (2 + -3y)

Combine like terms: 7 + 2 = 9
21 = 9 + -3y

Solving
21 = 9 + -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 = 9 + -3y + 3y

Combine like terms: -3y + 3y = 0
21 + 3y = 9 + 0
21 + 3y = 9

Add '-21' to each side of the equation.
21 + -21 + 3y = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 3y = 9 + -21
3y = 9 + -21

Combine like terms: 9 + -21 = -12
3y = -12

Divide each side by '3'.
y = -4

Simplifying
y = -4

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