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x in (-oo:+oo)
x/90 = 15/60 // - 15/60
x/90-(15/60) = 0
x/90-1/4 = 0
1/90*x-1/4 = 0 // + 1/4
1/90*x = 1/4 // : 1/90
x = 1/4/1/90
x = 45/2
x = 45/2
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