13/x+4=
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x/(-4) + 9 = 7 Therefore, x/(-4) = -2 Therefore, x = 8
You can divide the integers in this case - 4 divided by 2 and 9 divided by 3. You would get 2 over x plus 3 over x. 4/2x + 9/3x = 2/x + 3/x = 5/x
9
(2x + 8) / (3x - 9) + (3x + 12) / (x2 - 9) = 2(x + 4) / 3(x - 3) + 3(x + 4) / (x + 3)(x - 3) = [ 2(x + 4)(x + 3) + 9( x + 4 ) ] / 3(x + 3)(x - 3) = [ 2( x2 + 7x + 12 ) + 9x + 36 ] / 3(x + 3)(x - 3) = (2x2 + 23x + 48) / 3(x + 3)(x - 3)
It is x+9, provided that x is not -8.