7[2-4(y-1)]=7(2y+9)

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Solution for 7[2-4(y-1)]=7(2y+9) equation:


Simplifying
7[2 + -4(y + -1)] = 7(2y + 9)

Reorder the terms:
7[2 + -4(-1 + y)] = 7(2y + 9)
7[2 + (-1 * -4 + y * -4)] = 7(2y + 9)
7[2 + (4 + -4y)] = 7(2y + 9)

Combine like terms: 2 + 4 = 6
7[6 + -4y] = 7(2y + 9)
[6 * 7 + -4y * 7] = 7(2y + 9)
[42 + -28y] = 7(2y + 9)

Reorder the terms:
42 + -28y = 7(9 + 2y)
42 + -28y = (9 * 7 + 2y * 7)
42 + -28y = (63 + 14y)

Solving
42 + -28y = 63 + 14y

Solving for variable 'y'.

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

Add '-14y' to each side of the equation.
42 + -28y + -14y = 63 + 14y + -14y

Combine like terms: -28y + -14y = -42y
42 + -42y = 63 + 14y + -14y

Combine like terms: 14y + -14y = 0
42 + -42y = 63 + 0
42 + -42y = 63

Add '-42' to each side of the equation.
42 + -42 + -42y = 63 + -42

Combine like terms: 42 + -42 = 0
0 + -42y = 63 + -42
-42y = 63 + -42

Combine like terms: 63 + -42 = 21
-42y = 21

Divide each side by '-42'.
y = -0.5

Simplifying
y = -0.5

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