step-by-step explanation:
ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t. then add -3.6 + 1.2 which is -2.4
so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3