$\"\"$

The quadratic equation is $\"\"$ .

The equation compare to quadratic equation, then x = t, a = 3, b = - 7 and c = - 20.

Quadratic formula: $\"\"$ .

$\"\"$ (Substitute x = t, a = 3, b = - 7 and c = - 20)

$\"\"$ (Evaluate power: $\"\"$ )

$\"\"$ (Simplify)

$\"\"$ (Add: $\"\"$ ) $\"\"$

Evaluate square roots: $\"\"$

$\"\"$

Separate the solutions $\"\"$ .

$\"\"$ (Simplify)

$\"\"$

The solution set is $\"\"$ .