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x in (-oo:+oo)
-0.05 = (x-30)/30 // - (x-30)/30
-((x-30)/30)-0.05 = 0
(-1*(x-30))/30-0.05 = 0
(-1*(x-30))/30+(-0.05*30)/30 = 0
-1*(x-30)-0.05*30 = 0
28.5-x = 0
(28.5-x)/30 = 0
(28.5-x)/30 = 0 // * 30
28.5-x = 0
28.5-x = 0 // - 28.5
-x = -28.5 // * -1
x = 28.5
x = 28.5
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