3(20-y)=15

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Solution for 3(20-y)=15 equation: 


Simplifying
3(20 + -1y) = 15
(20 * 3 + -1y * 3) = 15
(60 + -3y) = 15

Solving
60 + -3y = 15

Solving for variable 'y'.

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

Add '-60' to each side of the equation.
60 + -60 + -3y = 15 + -60

Combine like terms: 60 + -60 = 0
0 + -3y = 15 + -60
-3y = 15 + -60

Combine like terms: 15 + -60 = -45
-3y = -45

Divide each side by '-3'.
y = 15

Simplifying
y = 15

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