7y-21=-8y

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


Simplifying
7y + -21 = -8y

Reorder the terms:
-21 + 7y = -8y

Solving
-21 + 7y = -8y

Solving for variable 'y'.

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

Add '8y' to each side of the equation.
-21 + 7y + 8y = -8y + 8y

Combine like terms: 7y + 8y = 15y
-21 + 15y = -8y + 8y

Combine like terms: -8y + 8y = 0
-21 + 15y = 0

Add '21' to each side of the equation.
-21 + 21 + 15y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 15y = 0 + 21
15y = 0 + 21

Combine like terms: 0 + 21 = 21
15y = 21

Divide each side by '15'.
y = 1.4

Simplifying
y = 1.4

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