What does x equal in the equation -2.3x-4.2x=-66.3

∆red ≅ ∆ by rule will give brainiest if possible

Find the value of x for which line a is parallel to line b

Jenny earned a 77 on her most recent test jenny score is no less then 5 points greater then 4/5 of terrance’s score if t represents terrance score which inequality represents the situation