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x=numero buscado
x/5+12-25=3(6)
x/5-13=18
x/5=18+13
x/5=31
x=5(31)
x=155=>respuesta
verificamos:
x/5+12-25=3(6)
155/5-13=18
31-13=18
18=18
igualdad verdadera
espero ayude
x/5 +12 -25 = 3*6
x/5 -13 = 18
x/5 = 18+13
x = 31*5
x = 155
el numero es 155
verificancion
155/5 +12 - 25 = 18
31+12 -25 = 18
18 = 18