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1.29 = (x-100)/10 // - (x-100)/10
1.29-((x-100)/10) = 0
(-1*(x-100))/10+1.29 = 0
(-1*(x-100))/10+(1.29*10)/10 = 0
1.29*10-1*(x-100) = 0
112.9-x = 0
(112.9-x)/10 = 0
(112.9-x)/10 = 0 // * 10
112.9-x = 0
112.9-x = 0 // - 112.9
-x = -112.9 // * -1
x = 112.9
x = 112.9
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