What is the missing step in this proof?1. AD/DB = CE/EB ———-> given2.AD/DB+1 = CE/EB+1 ——–> Addition Property of Equality 3.AD+DB/DB =CE+EB/EB —————>using common denominators4. AB = AD + DB CB = CE + EB ———-> segment addition5.AB/DB =CB/EB ——> Substitution Property of Equality6.angle ABC congruent to angle DBE ————> Reflexive Property of Congruence7.triangle ABC ~ triangle DBE———-> SAS similarity criterion8. MISSING PROOF? ——— > Corresponding angles of similar triangles are congruent.9.LINE DE || LINE AC —————————->If the corresponding angles formed by two lines cut by a transversal are congruent, then the lines are parallel.