y-(-9)=7

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Solution for y-(-9)=7 equation: 


Simplifying
y + -1(-9) = 7

Multiply -1 * -9
y + 9 = 7

Reorder the terms:
9 + y = 7

Solving
9 + y = 7

Solving for variable 'y'.

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

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

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

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

Simplifying
y = -2

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