639-y=87

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Solution for 639-y=87 equation:


Simplifying
639 + -1y = 87

Solving
639 + -1y = 87

Solving for variable 'y'.

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

Add '-639' to each side of the equation.
639 + -639 + -1y = 87 + -639

Combine like terms: 639 + -639 = 0
0 + -1y = 87 + -639
-1y = 87 + -639

Combine like terms: 87 + -639 = -552
-1y = -552

Divide each side by '-1'.
y = 552

Simplifying
y = 552

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