9y-7-8y=9y-y

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Solution for 9y-7-8y=9y-y equation:


Simplifying
9y + -7 + -8y = 9y + -1y

Reorder the terms:
-7 + 9y + -8y = 9y + -1y

Combine like terms: 9y + -8y = 1y
-7 + 1y = 9y + -1y

Combine like terms: 9y + -1y = 8y
-7 + 1y = 8y

Solving
-7 + 1y = 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.
-7 + 1y + -8y = 8y + -8y

Combine like terms: 1y + -8y = -7y
-7 + -7y = 8y + -8y

Combine like terms: 8y + -8y = 0
-7 + -7y = 0

Add '7' to each side of the equation.
-7 + 7 + -7y = 0 + 7

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

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

Divide each side by '-7'.
y = -1

Simplifying
y = -1

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