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x in (-oo:+oo)
90 = (100*x)/13000 // - (100*x)/13000
90-((100*x)/13000) = 0
(-1/130)*x+90 = 0
90-1/130*x = 0 // - 90
-1/130*x = -90 // : -1/130
x = -90/(-1/130)
x = 11700
x = 11700
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