If the problem is X-71=0, Then X=71, but if you intentionally put the space between the 7 and 1, then I'm not certain what operation is happening between them.
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8+-1= 7 x=-1
x = 1/2 [ 1 ± i sqrt(7) ]
7r2+48r-7 = (7x-1)(x+7) when factored
-5
y = x - 7 or, y = 1*x - 7 so that the slope is 1.