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x in (-oo:+oo)
-11.4 = (x-50)/12 // - (x-50)/12
-((x-50)/12)-11.4 = 0
(-1*(x-50))/12-11.4 = 0
(-1*(x-50))/12+(-11.4*12)/12 = 0
-1*(x-50)-11.4*12 = 0
-x-86.8 = 0
(-x-86.8)/12 = 0
(-x-86.8)/12 = 0 // * 12
-x-86.8 = 0
-x-86.8 = 0 // + 86.8
-x = 86.8 // * -1
x = -86.8
x = -86.8
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