Answer like this
-3
+20

Answer:
n=-8
Step-by-step explanation:
8-2(3.5n+2.1)=3(6.5-2.7n) -24.5
x2. = x3
8-7n-4.2 =19.5-8.1n-24.5
8-4.2. = 19.5-24.5
-7n+3.8=-8.1n -5
+8.1n = +8.1n
1.1n+3.8=-5
-3.8. = -3.8
1.1n= -8.8
÷1.1 = ÷1.1
n=-8
(Sorry that it looks so confusing)