9-7y=7-8y

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


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

Solving
9 + -7y = 7 + -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.
9 + -7y + 8y = 7 + -8y + 8y

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

Combine like terms: -8y + 8y = 0
9 + 1y = 7 + 0
9 + 1y = 7

Add '-9' to each side of the equation.
9 + -9 + 1y = 7 + -9

Combine like terms: 9 + -9 = 0
0 + 1y = 7 + -9
1y = 7 + -9

Combine like terms: 7 + -9 = -2
1y = -2

Divide each side by '1'.
y = -2

Simplifying
y = -2

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