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x in (-oo:+oo)
90 = (100*x)/1100 // - (100*x)/1100
90-((100*x)/1100) = 0
(-1/11)*x+90 = 0
90-1/11*x = 0 // - 90
-1/11*x = -90 // : -1/11
x = -90/(-1/11)
x = 990
x = 990
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