9x sq - 15x+6=0 by middle term splitting method
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9xsq-9x-6x+6=o
9x(x-1)+6(x-1)=o
(x-1)+ (9x+6)=o
- x-1=o........x=1
- 9x+6=o.......x= -6/9....divide by 3..x= -2/3
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