7x^2-18=-15x

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

Simplifying
7x2 + -18 = -15x

Reorder the terms:
-18 + 7x2 = -15x

Solving
-18 + 7x2 = -15x

Solving for variable 'x'.

Reorder the terms:
-18 + 15x + 7x2 = -15x + 15x

Combine like terms: -15x + 15x = 0
-18 + 15x + 7x2 = 0

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

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

Simplifying
-3 + -1x = 0

Solving
-3 + -1x = 0

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

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

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

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

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

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

Simplifying
6 + -7x = 0

Solving
6 + -7x = 0

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

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

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

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

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

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