If: 4x-4 = 12
Then: x = 4
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4x+3y = 12 3y = -4x+12 y = -4/3x+4
If: 4x+(-12) = 8 then 4x = 20 and x = 5
(4x2 - 13x - 12)/(4x+ 3) = (4x + 3)(x - 4)/(4x + 3) = (4x + 3)(x - 4)/(4x + 3) = x - 4 :)
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
7x + 16 = 3x + 4 4x = -12 x = -3