7-(-y)=21

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Solution for 7-(-y)=21 equation:


Simplifying
7 + -1(-1y) = 21

Remove parenthesis around (-1y)
7 + -1 * -1y = 21

Multiply -1 * -1
7 + 1y = 21

Solving
7 + 1y = 21

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 + 1y = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 1y = 21 + -7
1y = 21 + -7

Combine like terms: 21 + -7 = 14
1y = 14

Divide each side by '1'.
y = 14

Simplifying
y = 14

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