3.7 ( x - 1)^2 - 2.5 (x + 2) = x - 3.9 simplify
3.7 ( x ^2 - 2x + 1) - 2.5 (x + 2) = x - 3.9
3.7x^2 - 7.4x + 3.7 - 2.5x - 5 = x - 3.9
3.7x^2 - 9.9x - 1.3 = x - 3.9
3.7x^2 - 10.9x + 2.6 = 0 multiply through by 10
37x^2 - 109x + 26 = 0
Use the quad formula
x = 109 ±√ (109^2 - 4 (26)(37)
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2 * 37
This evaluates to
x ≈ .261 or x ≈ 2.684