Solve the following equations by using formula:
10ax2 - 6x + 15ax - 9 = 0 , a ≠ 0.
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x2 + (4 - 3a)x - 12a = 0
Solve for x using the quadratic formula. Write your answer correct to two significant figures : (x - 1)2 - 3x + 4 = 0 .