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Ex. 4 :

    (2x+8)/6 - (-4x-3)/2 = (-3x+4)/3

⇒  (2x+8)/6 - (3(-4x-3))/6 = (2(-3x+4))/6

⇒  2x+8 - (-12x-9) = -6x+8

⇒ 2x+8+12x+9 = -6x+8

⇒ 2x+12x+6x = 8-8-9

⇒ 20x = -9

⇒ x = -9/20

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