21=4y-7

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Solution for 21=4y-7 equation:


Simplifying
21 = 4y + -7

Reorder the terms:
21 = -7 + 4y

Solving
21 = -7 + 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 = -7 + 4y + -4y

Combine like terms: 4y + -4y = 0
21 + -4y = -7 + 0
21 + -4y = -7

Add '-21' to each side of the equation.
21 + -21 + -4y = -7 + -21

Combine like terms: 21 + -21 = 0
0 + -4y = -7 + -21
-4y = -7 + -21

Combine like terms: -7 + -21 = -28
-4y = -28

Divide each side by '-4'.
y = 7

Simplifying
y = 7

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