simplify ( 64/125 )-2/3 +( 256/625) -1/4*(3/
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1)x+a=0
x=-a
x³+ax²-2x+a+4=0
(-a)³+a(a)²-2(a)+a+4=0
-a³+a³-2a+a+4=0
-a+4=0
a=4
that is answer of the first question
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