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x ( 15 + x) = 0
x = -15 atau x = 0
2. 10 + x2 = 7x
x2 - 7x + 10 = 0
( x - 5) (x-2)
x = 5 x= 2
x(x+15)=0
x=0 atau x=-15
2). 10+x^2=7x
x^2-7x+10=0
(x-5)(x-2)=0
x=5 atau x=2