30x² + 7x -15
splitting the middle terms
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30x² + 7x -15
30x² +25x-18x -15=0
5x(6x+5)-3(6x+5)=0
(5x-3)(6x-5)=0
(5x-3)=0 or (6x-5)=0
x=3/5 or x=5/6.
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