120-y=4000

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Solution for 120-y=4000 equation: 


Simplifying
120 + -1y = 4000

Solving
120 + -1y = 4000

Solving for variable 'y'.

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

Add '-120' to each side of the equation.
120 + -120 + -1y = 4000 + -120

Combine like terms: 120 + -120 = 0
0 + -1y = 4000 + -120
-1y = 4000 + -120

Combine like terms: 4000 + -120 = 3880
-1y = 3880

Divide each side by '-1'.
y = -3880

Simplifying
y = -3880

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