Question

(x+1)(x+2)=(x-3)(x-4)​

Answer 1

(x + 1)(x + 2) = (x - 3)(x - 4)

=> x(x + 2) + 1(x + 2) = x(x - 4) - 3(x - 4)

=> x² + 2x + x + 2 = x² - 4x - 3x + 12

=> 3x + 2 = - 7x + 12 [x² and x² gets cancel]

=> 3x + 7x = 12 - 2

=> 10x = 10

=> x = 10/10

=> x = 1

Refer the attachment