7y+6-3y=y-21

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Solution for 7y+6-3y=y-21 equation:


Simplifying
7y + 6 + -3y = y + -21

Reorder the terms:
6 + 7y + -3y = y + -21

Combine like terms: 7y + -3y = 4y
6 + 4y = y + -21

Reorder the terms:
6 + 4y = -21 + y

Solving
6 + 4y = -21 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
6 + 4y + -1y = -21 + y + -1y

Combine like terms: 4y + -1y = 3y
6 + 3y = -21 + y + -1y

Combine like terms: y + -1y = 0
6 + 3y = -21 + 0
6 + 3y = -21

Add '-6' to each side of the equation.
6 + -6 + 3y = -21 + -6

Combine like terms: 6 + -6 = 0
0 + 3y = -21 + -6
3y = -21 + -6

Combine like terms: -21 + -6 = -27
3y = -27

Divide each side by '3'.
y = -9

Simplifying
y = -9

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