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1.28 = (x-50)/12 // - (x-50)/12
1.28-((x-50)/12) = 0
(-1*(x-50))/12+1.28 = 0
(-1*(x-50))/12+(1.28*12)/12 = 0
1.28*12-1*(x-50) = 0
65.36-x = 0
(65.36-x)/12 = 0
(65.36-x)/12 = 0 // * 12
65.36-x = 0
65.36-x = 0 // - 65.36
-x = -65.36 // * -1
x = 65.36
x = 65.36
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