-1=7-y-y

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


Simplifying
-1 = 7 + -1y + -1y

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

Solving
-1 = 7 + -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.
-1 + 2y = 7 + -2y + 2y

Combine like terms: -2y + 2y = 0
-1 + 2y = 7 + 0
-1 + 2y = 7

Add '1' to each side of the equation.
-1 + 1 + 2y = 7 + 1

Combine like terms: -1 + 1 = 0
0 + 2y = 7 + 1
2y = 7 + 1

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

Divide each side by '2'.
y = 4

Simplifying
y = 4

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