3(10)-5y=15

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Solution for 3(10)-5y=15 equation: 


Simplifying
3(10) + -5y = 15

Multiply 3 * 10
30 + -5y = 15

Solving
30 + -5y = 15

Solving for variable 'y'.

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

Add '-30' to each side of the equation.
30 + -30 + -5y = 15 + -30

Combine like terms: 30 + -30 = 0
0 + -5y = 15 + -30
-5y = 15 + -30

Combine like terms: 15 + -30 = -15
-5y = -15

Divide each side by '-5'.
y = 3

Simplifying
y = 3

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