Use the substitution y = 3x + 1 to solve for x :
5(3x + 1)2 + 6(3x + 1) - 8 = 0.
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Find the values of x if p + 1 = 0 and x2 + px - 6 = 0.
Find the values of x if p + 7 = 0, q - 12 = 0 and x2 + px + q = 0.