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(7 w)/8 = 21
(8×7 w)/(7×8) = 8/7×21
8/7×21 = (8×21)/7:
(8×7 w)/(7×8) = (8×21)/7
(8×7 w)/(7×8) = (7×8)/(7×8)×w = w:
w = (8×21)/7
21/7 = (7×3)/7 = 3:
w = 8×3
8×3 = 24:
w = 24
w=21:(7/8)
w=24
tenes que averiguar la incognita en que en este caso seria la w tenes que dividir 7/8 dividido en 21 dejando la w en el otro lado porque es lo que tenes que averiguar.