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x in (-oo:+oo)
x/90 = 100/36 // - 100/36
x/90-(100/36) = 0
x/90-25/9 = 0
1/90*x-25/9 = 0 // + 25/9
1/90*x = 25/9 // : 1/90
x = 25/9/1/90
x = 250
x = 250
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