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1.5 = (x-90)/(15/9) // - (x-90)/(15/9)
1.5-((x-90)/(15/9)) = 0
(-3/5)*(x-90)+1.5 = 0
1.5-3/5*(x-90) = 0
1.5-3/5*(x-90) = 0
55.5-3/5*x = 0
55.5-3/5*x = 0
55.5-3/5*x = 0 // - 55.5
-3/5*x = -55.5 // : -3/5
x = -55.5/(-3/5)
x = 92.5
x = 92.5
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