Question

с пропорциями
x-3/x-2=x+1/x+3

Answer 1

$\frac{x - 3}{x - 2} = \frac{x + 1}{x + 3} \\ x≠2 \\ x≠3 \\ (x - 3)(x + 3) = (x + 1)(x - 2) \\ x {}^{2} - 9 = x {}^{2} - 2x \times x \\ - 9 = - 2x \times x - 2 \\ - 9 = - x - 2 \\ x = - 2 + 9 \\ x = 7$