9-(-y-7)=3(y+4)-7(y+4)

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Solution for 9-(-y-7)=3(y+4)-7(y+4) equation:


Simplifying
9 + -1(-1y + -7) = 3(y + 4) + -7(y + 4)

Reorder the terms:
9 + -1(-7 + -1y) = 3(y + 4) + -7(y + 4)
9 + (-7 * -1 + -1y * -1) = 3(y + 4) + -7(y + 4)
9 + (7 + 1y) = 3(y + 4) + -7(y + 4)

Combine like terms: 9 + 7 = 16
16 + 1y = 3(y + 4) + -7(y + 4)

Reorder the terms:
16 + 1y = 3(4 + y) + -7(y + 4)
16 + 1y = (4 * 3 + y * 3) + -7(y + 4)
16 + 1y = (12 + 3y) + -7(y + 4)

Reorder the terms:
16 + 1y = 12 + 3y + -7(4 + y)
16 + 1y = 12 + 3y + (4 * -7 + y * -7)
16 + 1y = 12 + 3y + (-28 + -7y)

Reorder the terms:
16 + 1y = 12 + -28 + 3y + -7y

Combine like terms: 12 + -28 = -16
16 + 1y = -16 + 3y + -7y

Combine like terms: 3y + -7y = -4y
16 + 1y = -16 + -4y

Solving
16 + 1y = -16 + -4y

Solving for variable 'y'.

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

Add '4y' to each side of the equation.
16 + 1y + 4y = -16 + -4y + 4y

Combine like terms: 1y + 4y = 5y
16 + 5y = -16 + -4y + 4y

Combine like terms: -4y + 4y = 0
16 + 5y = -16 + 0
16 + 5y = -16

Add '-16' to each side of the equation.
16 + -16 + 5y = -16 + -16

Combine like terms: 16 + -16 = 0
0 + 5y = -16 + -16
5y = -16 + -16

Combine like terms: -16 + -16 = -32
5y = -32

Divide each side by '5'.
y = -6.4

Simplifying
y = -6.4

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