21=3(y+3)-7y

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


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

Reorder the terms:
21 = 3(3 + y) + -7y
21 = (3 * 3 + y * 3) + -7y
21 = (9 + 3y) + -7y

Combine like terms: 3y + -7y = -4y
21 = 9 + -4y

Solving
21 = 9 + -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 = 9 + -4y + 4y

Combine like terms: -4y + 4y = 0
21 + 4y = 9 + 0
21 + 4y = 9

Add '-21' to each side of the equation.
21 + -21 + 4y = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 4y = 9 + -21
4y = 9 + -21

Combine like terms: 9 + -21 = -12
4y = -12

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

Simplifying
y = -3

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