x divided by x^2-3x-4 subtracted by 4 divided by x +1
x divided by x^2-3x-4 subtracted by 4 divided by x +1 as x/(x^2 -3x - 4) - 4/(x+1) then = x/( (x+1)(x-4) - 4/(x+1) now your common denominator is (x+1)(x-4) take over
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