Answer:
See Below
Step-by-step explanation:
First, isolate x. To do that add 3.5 to each side
x - 3.5 = -3.1
+3.5 +3.5
x= 0.4
X-3.5= -3.1 add 3.5 each side.
X = 3.5 - 3.1 simplify
X = 0.4 done!
