Решите, пожалуйста!!! Очень нужно!!!
а) (x-4)(x+5)(x+10)(x-2)=18^2
b) (4x)/(x^2+4x+4) - (x-2)/(x^2+2x)=1/x
c) ((x)/(x-1))^2+((x)/(x+1))^2=90
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