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7=x+1
6=x
(x+ 7)(x + 1) so x = -1 or -7
x = 3
8+-1= 7 x=-1
x=1
(3, 1)
7 x 1?
7
-1
x = 2
6-x+12 = 10x+7 6+12-7 = 10x+x 11 = 11x x = 1