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x in (-oo:+oo)
30 = 100*(x/22) // - 100*(x/22)
30-(100*(x/22)) = 0
(-50/11)*x+30 = 0
30-50/11*x = 0 // - 30
-50/11*x = -30 // : -50/11
x = -30/(-50/11)
x = 33/5
x = 33/5
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