(x+1)(x+2)/(x+11)x-2)=1
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(x+1)(x+2)/(x+11)(x-2) = 1
(x+1)(x+2) = (x+11)(x-2)
x² + 2x + x + 2 = x² - 2x + 11x - 22
x² + 3x + 2 = x² + 9x - 22
take like terms one side, we get
x² - x² + 3x - 9x = -22 - 2
-6x = -24
minus is cancelled from both sides, we get
x = 24/6
x = 4
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