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12/8=x/3
x=12*3/8=4,5
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3x/9=12/18
18*3*x=12*9
54*x=108
x=108/54=2
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x/21=3/9
9*x=21*3
x=63/9=7
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3+x/12=4/6
(36+x)/12=4/6
3*(36+x)/12*2
36+x=8
x=8-36=-28
espero que sea esto lo que buscas.