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12/20 = 6/x se nota que x es 10 pero sigamos
12/20 * x = 6
x = 6 ÷ 12/20
x = 120/12 = 10
-6/x = 3/2 se nota que x es -4 pero igual sigamos
-6 = 3/2 * x
-6 ÷ 3/2 = x
-12/3 = x
-4 = x
x/45 = 20/75
x = 20/75 * 45
x = 900/75
x = 12
12.x=6.20
12x=120
x=10
2)-6/x=3/2
-6.2=3.X
-12=3X
- 4=X
3)X/45=20/75
75.X=20.45
75X=900
X=12