100x^2 -30x+9=100x^2+70x+49
100x^2-30x+9-100x^2-70x-49=0
-100x-40=0
-100x=40
X=40:(-100)
x= -0,4
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100x^2 -30x+9=100x^2+70x+49
100x^2-30x+9-100x^2-70x-49=0
-100x-40=0
-100x=40
X=40:(-100)
x= -0,4