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x in (-oo:+oo)
-9.8 = (x-40)/5 // - (x-40)/5
-((x-40)/5)-9.8 = 0
(-1*(x-40))/5-9.8 = 0
(-1*(x-40))/5+(-9.8*5)/5 = 0
-1*(x-40)-9.8*5 = 0
-x-9 = 0
(-x-9)/5 = 0
(-x-9)/5 = 0 // * 5
-x-9 = 0
-x-9 = 0 // + 9
-x = 9 // * -1
x = -9
x = -9
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