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4x-9+7x+4=0
4x+7x-5=0
a=4 b=7 c=-5
x=-b+ b-4ac
2a
x=-7+ 7-4(4) (-5)
2(4)


-
2
2


-


x=-7+ 49+80
8
x=-7+ 129
8
x=-7+ 129
8
x=-7- 129
8

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2
2