3n+4(n-9)=-78

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Solution for 3n+4(n-9)=-78 equation:


Simplifying
3n + 4(n + -9) = -78

Reorder the terms:
3n + 4(-9 + n) = -78
3n + (-9 * 4 + n * 4) = -78
3n + (-36 + 4n) = -78

Reorder the terms:
-36 + 3n + 4n = -78

Combine like terms: 3n + 4n = 7n
-36 + 7n = -78

Solving
-36 + 7n = -78

Solving for variable 'n'.

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

Add '36' to each side of the equation.
-36 + 36 + 7n = -78 + 36

Combine like terms: -36 + 36 = 0
0 + 7n = -78 + 36
7n = -78 + 36

Combine like terms: -78 + 36 = -42
7n = -42

Divide each side by '7'.
n = -6

Simplifying
n = -6

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