Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

Final term is not finished

6-2*x == 9 or -9 == 6-2*x

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

6-2*x == 9 or 15 == 2*x

⇒ algebra.equations.coverup.times

6-2*x == 9 or 15/2 == x

⇒ algebra.equations.linear.flip

6-2*x == 9 or x == 15/2