Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
6-2*x == 9 or x == 15/2
⇒ algebra.equations.coverup.onevar.minus-right2*x == -3 or x == 15/2
⇒ algebra.equations.coverup.timesx == -3/2 or x == 15/2