Answer:
-2.1
Step-by-step explanation:
a + (-1.6) = -3.7 (expand parentheses)
a - 1.6 = -3.7 (add 1.6 to both sides)
a - 1.6 + 1.6= -3.7 + 1.6
a = -3.7 +1.6
a = -2.1
