x/3 + x/4 is impossible to solve without knowing what x is. However let's say that x is 3 - 3/3 is the same as saying 3 divided by 3. So your taking your numerator (Top) divided by your denominator (Bottom) and you get your answer. So 3 divided by 3 is 1, 3 divided by 4 is 0.75 - That would be your answers.
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x=-1 ^ how do you know?
11+(7-3)2=
(x+3)(x+4) = x2+7x+12
(4x + 12)/(8x - 4y) = [4(x) + 4(3)]/(4(2)(x) - 4y] = 4(x + 3)/4(2x - y) = (x+ 3)/(2x - y)
(3/4)/4 + 1/4 = (3/4)(1/4 + 1/4 = 3/16 + 1/4 = 3/16 + (1 x 4)/(4 x 4) = 3/16 + 4/16 = 7/16