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1) x×2=420
x=210
2)x×5=420
x=84
3)x×4=420
x=105
4)x×7=420
x=60
2.r/p: es 84 84x5: 420
3. r/p: es 105 105x4: 420
4. r/p: es 60 60x7: 420
solucionado.......