3x=2/3
x= 2/3 :3
x=3/2 *3 - 3 cu 3 se simplifică
x = 2
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12x = 3/4
x = 3/4 :12
x= 4/3 * 12 - 4 se simplifică cu 12 =3
x = 3*3
x = 9
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7= 5x/3
x/3= 7*5
x/3 = 30
x=30:3
x= 10
