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5x2 + 8x = 7
5x2 + 8x - 7 = 0
This cannot be factorised so the solutions need to be determined using the quadratic formula
The solutions are {-8 ± sqrt[82 - 4*5*(-7)]}/(2*5)
= {-8 ± sqrt[64 + 140]}/10
= {-8 ± sqrt[204]}/10
= -2.22829 and 0.62829 (to 5 dp)
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