Correct: x^2-8x+15=0, 〖2x〗^2+4x-1=0, s^2+5s-4=0, 〖2r〗^2-2r-15=0, 〖3x〗^2-6x-10=0, Incorrect: 8k-3=12, 2s+3t=-7, 6p=10, 1/2(h-6)=0, 12-4x=0,

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