-5y+21=-7(y-1)

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Solution for -5y+21=-7(y-1) equation:


Simplifying
-5y + 21 = -7(y + -1)

Reorder the terms:
21 + -5y = -7(y + -1)

Reorder the terms:
21 + -5y = -7(-1 + y)
21 + -5y = (-1 * -7 + y * -7)
21 + -5y = (7 + -7y)

Solving
21 + -5y = 7 + -7y

Solving for variable 'y'.

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

Add '7y' to each side of the equation.
21 + -5y + 7y = 7 + -7y + 7y

Combine like terms: -5y + 7y = 2y
21 + 2y = 7 + -7y + 7y

Combine like terms: -7y + 7y = 0
21 + 2y = 7 + 0
21 + 2y = 7

Add '-21' to each side of the equation.
21 + -21 + 2y = 7 + -21

Combine like terms: 21 + -21 = 0
0 + 2y = 7 + -21
2y = 7 + -21

Combine like terms: 7 + -21 = -14
2y = -14

Divide each side by '2'.
y = -7

Simplifying
y = -7

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