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8n=31+11
8n=42
n=42/8
n=5,25 atau 5 2/8
2. 13+5b=38
5b=38-13
5b=25
b=25/5
b=5
3. 17-4m=49
-4m=49-17
-4m=32
m=32/-4
m=-8
4. 6x+12=2x
12=2x-6x
12= -4x
12/-4=x
-3=x
5. 13b-9=6b+19
13b-6b=19+9
7b=28
b=28/7
b=4
maaf ya kalau misalkan ada yang salah