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x in (-oo:+oo)
2.5 = x/90 // - x/90
2.5-(x/90) = 0
2.5-1/90*x = 0 // - 2.5
-1/90*x = -2.5 // : -1/90
x = -2.5/(-1/90)
x = 225.0000225
x = 225.0000225
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