(-7x+15-2x^2)=0

Solution for (-7x+15-2x^2)=0 equation:

Simplifying
(-7x + 15 + -2x2) = 0

Reorder the terms:
(15 + -7x + -2x2) = 0

Remove parenthesis around (15 + -7x + -2x2)
15 + -7x + -2x2 = 0

Solving
15 + -7x + -2x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(3 + -2x)(5 + x) = 0

Subproblem 1
Set the factor '(3 + -2x)' equal to zero and attempt to solve:

Simplifying
3 + -2x = 0

Solving
3 + -2x = 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 + -2x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -2x = 0 + -3
-2x = 0 + -3

Combine like terms: 0 + -3 = -3
-2x = -3

Divide each side by '-2'.
x = 1.5

Simplifying
x = 1.5
Subproblem 2
Set the factor '(5 + x)' equal to zero and attempt to solve:

Simplifying
5 + x = 0

Solving
5 + x = 0

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

Add '-5' to each side of the equation.
5 + -5 + x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + x = 0 + -5
x = 0 + -5

Combine like terms: 0 + -5 = -5
x = -5

Simplifying
x = -5
Solution
x = {1.5, -5}