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x in (-oo:+oo)
(1/2)*x+(3/5)*x = 209 // - 209
(1/2)*x+(3/5)*x-209 = 0
11/10*x-209 = 0 // + 209
11/10*x = 209 // : 11/10
x = 209/11/10
x = 190
x = 190
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