20-y=15

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Solution for 20-y=15 equation: 


Simplifying
20 + -1y = 15

Solving
20 + -1y = 15

Solving for variable 'y'.

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

Add '-20' to each side of the equation.
20 + -20 + -1y = 15 + -20

Combine like terms: 20 + -20 = 0
0 + -1y = 15 + -20
-1y = 15 + -20

Combine like terms: 15 + -20 = -5
-1y = -5

Divide each side by '-1'.
y = 5

Simplifying
y = 5

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