Question 120741
add: a(3)c(2)/x+ x(3)-cx(2)/m 
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a^3 c^2/x + x^3 -cx^2/m

lcd = mx
Rewrite each term with mx as its denominator:

ma^3c^2/lcd + mx^4/lcd -cx^3/lcd

Combine the fractions over the lcd:

[mx^3c^2+mx^4-cx^3]/lcd

= [x^3(mc^2+m-c)]/mx

= [x^2(mc^2+m-c]/m

= x^2[m(c^2-1)-c]/m

This might not be the final form you are looking for;
there are alot of options for a final form.
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Cheerd,
Stan H.