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

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Solution for 5y-7y=7y+21-5y equation: 


Simplifying
5y + -7y = 7y + 21 + -5y

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

Reorder the terms:
-2y = 21 + 7y + -5y

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

Solving
-2y = 21 + 2y

Solving for variable 'y'.

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

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

Combine like terms: -2y + -2y = -4y
-4y = 21 + 2y + -2y

Combine like terms: 2y + -2y = 0
-4y = 21 + 0
-4y = 21

Divide each side by '-4'.
y = -5.25

Simplifying
y = -5.25

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