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x in (-oo:+oo)
(70*(1-x))/100 = 1 // - 1
(70*(1-x))/100-1 = 0
(70*(1-x))/100+(-1*100)/100 = 0
70*(1-x)-1*100 = 0
-70*x-30 = 0
(-70*x-30)/100 = 0
(-70*x-30)/100 = 0 // * 100
-70*x-30 = 0
-70*x-30 = 0 // + 30
-70*x = 30 // : -70
x = 30/(-70)
x = -3/7
x = -3/7
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