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x in (-oo:+oo)
x/90 = 40/100 // - 40/100
x/90-(40/100) = 0
x/90-2/5 = 0
1/90*x-2/5 = 0 // + 2/5
1/90*x = 2/5 // : 1/90
x = 2/5/1/90
x = 36
x = 36
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