-12n-(-9n)-13n+20n-(-5n)=-18

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Solution for -12n-(-9n)-13n+20n-(-5n)=-18 equation: 


Simplifying
-12n + -1(-9n) + -13n + 20n + -1(-5n) = -18

Remove parenthesis around (-9n)
-12n + -1 * -9n + -13n + 20n + -1(-5n) = -18

Multiply -1 * -9
-12n + 9n + -13n + 20n + -1(-5n) = -18

Remove parenthesis around (-5n)
-12n + 9n + -13n + 20n + -1 * -5n = -18

Multiply -1 * -5
-12n + 9n + -13n + 20n + 5n = -18

Combine like terms: -12n + 9n = -3n
-3n + -13n + 20n + 5n = -18

Combine like terms: -3n + -13n = -16n
-16n + 20n + 5n = -18

Combine like terms: -16n + 20n = 4n
4n + 5n = -18

Combine like terms: 4n + 5n = 9n
9n = -18

Solving
9n = -18

Solving for variable 'n'.

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

Divide each side by '9'.
n = -2

Simplifying
n = -2

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