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= 7-8-5m+15m
= -1+10m
Jadi Jawabannya
2. -8+15m - (-18)-21m
= -8-(-18)+15m-21m
= -8+18+15m-21m
=10-6m
Jadi jawabnya
3. Hasil no.1 + 10-6m
= -1+10m + 10-6m
= -1+10+10m-6m
=9+4m
Jadi jawabannya
maaf klo salah :')