7-8y=-9

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Solution for 7-8y=-9 equation: 


Simplifying
7 + -8y = -9

Solving
7 + -8y = -9

Solving for variable 'y'.

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

Add '-7' to each side of the equation.
7 + -7 + -8y = -9 + -7

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

Combine like terms: -9 + -7 = -16
-8y = -16

Divide each side by '-8'.
y = 2

Simplifying
y = 2

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