7(7y-4)=21y

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


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

Reorder the terms:
7(-4 + 7y) = 21y
(-4 * 7 + 7y * 7) = 21y
(-28 + 49y) = 21y

Solving
-28 + 49y = 21y

Solving for variable 'y'.

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

Add '-21y' to each side of the equation.
-28 + 49y + -21y = 21y + -21y

Combine like terms: 49y + -21y = 28y
-28 + 28y = 21y + -21y

Combine like terms: 21y + -21y = 0
-28 + 28y = 0

Add '28' to each side of the equation.
-28 + 28 + 28y = 0 + 28

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

Combine like terms: 0 + 28 = 28
28y = 28

Divide each side by '28'.
y = 1

Simplifying
y = 1

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