On fait un produit en croix:
x * (-1/3) = 4*5
-x/3 = 20
-x = 3*20
-x = 60
x = -60
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Verified answer
On fait un produit en croix:
x * (-1/3) = 4*5
-x/3 = 20
-x = 3*20
-x = 60
x = -60
Verified answer