(In the future, please put parentheses aroung multi-term numerators and denominators. Tutors are more likely to respond to a problem that is clearly stated.)
4x^2 -5x -32/7
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7x+3 /28x^3 -23x^2 -47x -18
28x^3 +12x^2
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-35x^2 -47x
-35x^2 -15x
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-32x -18
-32x -96/7
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-30/7
So
The remainder fraction will simplify: