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x in (-oo:+oo)
(7*(1-x))/10 = 1 // - 1
(7*(1-x))/10-1 = 0
(7*(1-x))/10+(-1*10)/10 = 0
7*(1-x)-1*10 = 0
-7*x-3 = 0
(-7*x-3)/10 = 0
(-7*x-3)/10 = 0 // * 10
-7*x-3 = 0
-7*x-3 = 0 // + 3
-7*x = 3 // : -7
x = 3/(-7)
x = -3/7
x = -3/7
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