21y=4(5y-7)

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Solution for 21y=4(5y-7) equation:


Simplifying
21y = 4(5y + -7)

Reorder the terms:
21y = 4(-7 + 5y)
21y = (-7 * 4 + 5y * 4)
21y = (-28 + 20y)

Solving
21y = -28 + 20y

Solving for variable 'y'.

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

Add '-20y' to each side of the equation.
21y + -20y = -28 + 20y + -20y

Combine like terms: 21y + -20y = 1y
1y = -28 + 20y + -20y

Combine like terms: 20y + -20y = 0
1y = -28 + 0
1y = -28

Divide each side by '1'.
y = -28

Simplifying
y = -28

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