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Anonymous
2/5 = 4/10 minus 1/10 is 3/10
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10-2 = 1 / 102 = 1/100
x=-1 ^ how do you know?
x = 3.5
A negative minus a positive is a negative. i.e -1-(+1)= -2
x2 - x - 2 = 0(x - 2)(x + 1) = 0x = 2 and -1