4) 13n:4=26 n=26*4/13=8
5)21m:18=7 m=7*18/21=6
6) 9n*13=351 n=351/13/9=3
4) 19n-6n=26×4, 13n=26×4, n=26×4/13=2×4=8 5) 16m+5m=7*18, 21m=7×18, m=7*18/21=6 6)17n-8n=351/13, 9n=351/13, n=3
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4) 13n:4=26 n=26*4/13=8
5)21m:18=7 m=7*18/21=6
6) 9n*13=351 n=351/13/9=3
4) 19n-6n=26×4, 13n=26×4, n=26×4/13=2×4=8 5) 16m+5m=7*18, 21m=7×18, m=7*18/21=6 6)17n-8n=351/13, 9n=351/13, n=3