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0.3x=0.2(0.06x+0.18)
Usa la propiedad distributiva
0.3x=0.012x+0.036
0.300x-0.012x=0.036
0.288x=0.036
x=0.036/0.288
x=0.125
Si se te dificulta la division en decimales pasalo a fraccion
x=(36/1000)/(288/1000)
x=(36/1000(*(1000*288)
x=36000/288000
Luego simplifica
x=1/8
0,3x = 0,012x + 0,036
-0,036 = 0,012x - 0,3x
-0,036 = -0,288x
Y menos con menos se van.
0,036 = 0,288x
8 = x