9=2y-1-7

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Solution for 9=2y-1-7 equation:


Simplifying
9 = 2y + -1 + -7

Reorder the terms:
9 = -1 + -7 + 2y

Combine like terms: -1 + -7 = -8
9 = -8 + 2y

Solving
9 = -8 + 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.
9 + -2y = -8 + 2y + -2y

Combine like terms: 2y + -2y = 0
9 + -2y = -8 + 0
9 + -2y = -8

Add '-9' to each side of the equation.
9 + -9 + -2y = -8 + -9

Combine like terms: 9 + -9 = 0
0 + -2y = -8 + -9
-2y = -8 + -9

Combine like terms: -8 + -9 = -17
-2y = -17

Divide each side by '-2'.
y = 8.5

Simplifying
y = 8.5

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