3(1-2y)+y=18

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Solution for 3(1-2y)+y=18 equation: 


Simplifying
3(1 + -2y) + y = 18
(1 * 3 + -2y * 3) + y = 18
(3 + -6y) + y = 18

Combine like terms: -6y + y = -5y
3 + -5y = 18

Solving
3 + -5y = 18

Solving for variable 'y'.

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

Add '-3' to each side of the equation.
3 + -3 + -5y = 18 + -3

Combine like terms: 3 + -3 = 0
0 + -5y = 18 + -3
-5y = 18 + -3

Combine like terms: 18 + -3 = 15
-5y = 15

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

Simplifying
y = -3

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