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x in (-oo:+oo)
(11*x)/20-7 = x/5+28 // - x/5+28
(11*x)/20-(x/5)-28-7 = 0
7/20*x-35 = 0 // + 35
7/20*x = 35 // : 7/20
x = 35/7/20
x = 100
x = 100
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