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2.3 = (x-100)/15 // - (x-100)/15
2.3-((x-100)/15) = 0
(-1*(x-100))/15+2.3 = 0
(-1*(x-100))/15+(2.3*15)/15 = 0
2.3*15-1*(x-100) = 0
134.5-x = 0
(134.5-x)/15 = 0
(134.5-x)/15 = 0 // * 15
134.5-x = 0
134.5-x = 0 // - 134.5
-x = -134.5 // * -1
x = 134.5
x = 134.5
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