7n^2-18=-15n

Solution for 7n^2-18=-15n equation:

Simplifying
7n2 + -18 = -15n

Reorder the terms:
-18 + 7n2 = -15n

Solving
-18 + 7n2 = -15n

Solving for variable 'n'.

Reorder the terms:
-18 + 15n + 7n2 = -15n + 15n

Combine like terms: -15n + 15n = 0
-18 + 15n + 7n2 = 0

Factor a trinomial.
(-3 + -1n)(6 + -7n) = 0

Subproblem 1
Set the factor '(-3 + -1n)' equal to zero and attempt to solve:

Simplifying
-3 + -1n = 0

Solving
-3 + -1n = 0

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

Add '3' to each side of the equation.
-3 + 3 + -1n = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1n = 0 + 3
-1n = 0 + 3

Combine like terms: 0 + 3 = 3
-1n = 3

Divide each side by '-1'.
n = -3

Simplifying
n = -3
Subproblem 2
Set the factor '(6 + -7n)' equal to zero and attempt to solve:

Simplifying
6 + -7n = 0

Solving
6 + -7n = 0

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

Add '-6' to each side of the equation.
6 + -6 + -7n = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -7n = 0 + -6
-7n = 0 + -6

Combine like terms: 0 + -6 = -6
-7n = -6

Divide each side by '-7'.
n = 0.8571428571

Simplifying
n = 0.8571428571
Solution
n = {-3, 0.8571428571}