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5x=35x-21+3
5x-35x=-21+3
-30x= -18
30x=18
x=18/30
5x=35x-21+3
5x=35x-18
-30x=-18
x=- 18/-30
x= 3/5
prueba
5*3/5=7(5*3/5-3)+3
3=3