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2x² +10x +3x +15 = 0
(2x² +10x) +(3x +15) = 0
2x(x +5) +3(x +5) = 0
(2x +3) (x +5) = 0
2x +3 = 0
2x = -3
x₁ = -3/2
x +5 = 0
x₂ = -5
Jadi, Himpunan penyelesaiannya adalah {-3/2,-5}.