3(2+-0.5y)-2y=13

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Solution for 3(2+-0.5y)-2y=13 equation: 


Simplifying
3(2 + -0.5y) + -2y = 13
(2 * 3 + -0.5y * 3) + -2y = 13
(6 + -1.5y) + -2y = 13

Combine like terms: -1.5y + -2y = -3.5y
6 + -3.5y = 13

Solving
6 + -3.5y = 13

Solving for variable 'y'.

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

Add '-6' to each side of the equation.
6 + -6 + -3.5y = 13 + -6

Combine like terms: 6 + -6 = 0
0 + -3.5y = 13 + -6
-3.5y = 13 + -6

Combine like terms: 13 + -6 = 7
-3.5y = 7

Divide each side by '-3.5'.
y = -2

Simplifying
y = -2

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