The because(6x) as x tends to 0 is 1. Substitute 1 for because(6x) term

The 3x as x tends to 0 is 0. Substitute x for 3x term

The term 1/x as x tends to 0 is infinity substitute infinity for because(6x)/3x

Thus 1 - (infinity) tends to - infinity.

The 3x as x tends to 0 is 0. Substitute x for 3x term

The term 1/x as x tends to 0 is infinity substitute infinity for because(6x)/3x

Thus 1 - (infinity) tends to - infinity.