7y+21=y-3

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


Simplifying
7y + 21 = y + -3

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

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

Solving
21 + 7y = -3 + 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.
21 + 7y + -1y = -3 + y + -1y

Combine like terms: 7y + -1y = 6y
21 + 6y = -3 + y + -1y

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

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

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

Combine like terms: -3 + -21 = -24
6y = -24

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

Simplifying
y = -4

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