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Using PEDMAS, you would have to do the parentheses part first(you would multiply 5 by 4 and 5 by -1.5x.

Step-by-step explanation:

Step: 3

Reason:Alternate interior angles theorem.

Step-by-step explanation:

We are given that

and both lines are cut by transversal t.

We have to find third step in proof.

Proof:

Step 1:

Reason :Given

Step 2:

Reason: Verticale angles theorem.

Step: 3

Reason:Alternate interior angles theorem.

Step 4:

Reason: Transitive property of congruence

Step 5:

Reason:Vertical angles theorem

Step 6:

Reason:Transitive property of congruence.

Hence, proved