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x in (-oo:+oo)
0.05 = (x-30)/30 // - (x-30)/30
0.05-((x-30)/30) = 0
(-1*(x-30))/30+0.05 = 0
(-1*(x-30))/30+(0.05*30)/30 = 0
0.05*30-1*(x-30) = 0
31.5-x = 0
(31.5-x)/30 = 0
(31.5-x)/30 = 0 // * 30
31.5-x = 0
31.5-x = 0 // - 31.5
-x = -31.5 // * -1
x = 31.5
x = 31.5
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