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x in (-oo:+oo)
(7/2)*x = 105/2 // - 105/2
(7/2)*x-(105/2) = 0
(7/2)*x-105/2 = 0
7/2*x-105/2 = 0 // + 105/2
7/2*x = 105/2 // : 7/2
x = 105/2/7/2
x = 15
x = 15
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