720-(180-y)=180-y

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Solution for 720-(180-y)=180-y equation: 


Simplifying
720 + -1(180 + -1y) = 180 + -1y
720 + (180 * -1 + -1y * -1) = 180 + -1y
720 + (-180 + 1y) = 180 + -1y

Combine like terms: 720 + -180 = 540
540 + 1y = 180 + -1y

Solving
540 + 1y = 180 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
540 + 1y + y = 180 + -1y + y

Combine like terms: 1y + y = 2y
540 + 2y = 180 + -1y + y

Combine like terms: -1y + y = 0
540 + 2y = 180 + 0
540 + 2y = 180

Add '-540' to each side of the equation.
540 + -540 + 2y = 180 + -540

Combine like terms: 540 + -540 = 0
0 + 2y = 180 + -540
2y = 180 + -540

Combine like terms: 180 + -540 = -360
2y = -360

Divide each side by '2'.
y = -180

Simplifying
y = -180

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