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7a-6 7a=6 a=6/7
C.4n-3+8n= 12n-3
12n=3
n=3/12 atau 1/4
D.19p+7-6p-5
13p+2 13p=-2 p=-2/13
E. 12m-5-8m=4m-5
4m=5
m=5/4
F. 5-3b+12=-3b+17
-3b=-17
b=-17/-3
maaf kalau yang b saya gak maksud