1-(-1y)=9

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Solution for 1-(-1y)=9 equation: 


Simplifying
1 + -1(-1y) = 9

Remove parenthesis around (-1y)
1 + -1 * -1y = 9

Multiply -1 * -1
1 + 1y = 9

Solving
1 + 1y = 9

Solving for variable 'y'.

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

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

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

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

Divide each side by '1'.
y = 8

Simplifying
y = 8

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