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Espero que te sirva, salu2!!!!
3/4x+15/4+1/3x+1/8=x+4
(9+4)x/12+(30+1)/8=x+4
13x/12+31/8=x+4
13x/12-x=4-(31/8)
13x-12x=(32-31)/8
x=1/8