7(7y-8)=21y

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Solution for 7(7y-8)=21y equation:


Simplifying
7(7y + -8) = 21y

Reorder the terms:
7(-8 + 7y) = 21y
(-8 * 7 + 7y * 7) = 21y
(-56 + 49y) = 21y

Solving
-56 + 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.
-56 + 49y + -21y = 21y + -21y

Combine like terms: 49y + -21y = 28y
-56 + 28y = 21y + -21y

Combine like terms: 21y + -21y = 0
-56 + 28y = 0

Add '56' to each side of the equation.
-56 + 56 + 28y = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 28y = 0 + 56
28y = 0 + 56

Combine like terms: 0 + 56 = 56
28y = 56

Divide each side by '28'.
y = 2

Simplifying
y = 2

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