84=12(2y-1)

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Solution for 84=12(2y-1) equation:


Simplifying
84 = 12(2y + -1)

Reorder the terms:
84 = 12(-1 + 2y)
84 = (-1 * 12 + 2y * 12)
84 = (-12 + 24y)

Solving
84 = -12 + 24y

Solving for variable 'y'.

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

Add '-24y' to each side of the equation.
84 + -24y = -12 + 24y + -24y

Combine like terms: 24y + -24y = 0
84 + -24y = -12 + 0
84 + -24y = -12

Add '-84' to each side of the equation.
84 + -84 + -24y = -12 + -84

Combine like terms: 84 + -84 = 0
0 + -24y = -12 + -84
-24y = -12 + -84

Combine like terms: -12 + -84 = -96
-24y = -96

Divide each side by '-24'.
y = 4

Simplifying
y = 4

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