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21x-8=8
21x=8+8
21x=16
x=16/21
5X/3+4X/2=6X-1
5X/3+4X/2-6X= -1
10+12-36/6=-1
-14/6x=-1
-14x=-1*6
x=-6/-14 (se cancelan los negativos y pasa ser positivo el resultado)
x=3/7