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128 = 4*(5/6)*(x-15) // - 4*(5/6)*(x-15)
128-(4*(5/6)*(x-15)) = 0
(-10/3)*(x-15)+128 = 0
128-10/3*(x-15) = 0
128-10/3*(x-15) = 0
178-10/3*x = 0
178-10/3*x = 0
178-10/3*x = 0 // - 178
-10/3*x = -178 // : -10/3
x = -178/(-10/3)
x = 267/5
x = 267/5
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