-663=6n+9(-9-7)

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Solution for -663=6n+9(-9-7) equation:


Simplifying
-663 = 6n + 9(-9 + -7)

Combine like terms: -9 + -7 = -16
-663 = 6n + 9(-16)

Multiply 9 * -16
-663 = 6n + -144

Reorder the terms:
-663 = -144 + 6n

Solving
-663 = -144 + 6n

Solving for variable 'n'.

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

Add '-6n' to each side of the equation.
-663 + -6n = -144 + 6n + -6n

Combine like terms: 6n + -6n = 0
-663 + -6n = -144 + 0
-663 + -6n = -144

Add '663' to each side of the equation.
-663 + 663 + -6n = -144 + 663

Combine like terms: -663 + 663 = 0
0 + -6n = -144 + 663
-6n = -144 + 663

Combine like terms: -144 + 663 = 519
-6n = 519

Divide each side by '-6'.
n = -86.5

Simplifying
n = -86.5

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