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9/2x+6 -7/5x+15 - 2/3=
9/2x- 7/5x +6+15 - 2/3=
(9/2x- 7/5x ) +(6+15 - 2/3)=
31/10 x= -61/3
x= - 610/93
verificando...
9/2 (- 610/93)+6 - 7/5(- 610/93)+15 = 2/3
9/2 (- 610/93)- 7/5(- 610/93)= 2/3-6-15
-20,333=-20,333