The engine provides a forward going force equal and opposite to the backward going frictional forces (which include air friction and rolling friction between the tires and the road).
(The engine; provides; a forward going force equal and opposite to the backward going frictional forces) (the backward going frictional forces; include; air friction)
The engine the backward going frictional forces
provides include
a forward going force equal and opposite to the backward going frictional forces
air friction