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x in (-oo:+oo)
(7*x)/50 = 99.5 // - 99.5
(7*x)/50-99.5 = 0
7/50*x-99.5 = 0 // + 99.5
7/50*x = 99.5 // : 7/50
x = 99.5/7/50
x = 710.71428571
x = 710.71428571
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