Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

(3*x-1)*(x+3) == 0

⇒ algebra.equations.quadratic.product-zero

3*x-1 == 0 or x == -3

⇒ algebra.equations.coverup.onevar.minus-left

3*x == 1 or x == -3

⇒ algebra.equations.coverup.times

x == 1/3 or x == -3