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x in (-oo:+oo)
3.9/5 = x/90 // - x/90
3.9/5-(x/90) = 0
0.78-1/90*x = 0 // - 0.78
-1/90*x = -0.78 // : -1/90
x = -0.78/(-1/90)
x = 70.20000702
x = 70.20000702
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