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x in (-oo:+oo)
(4*x)/2-(15/3) = 3 // - 3
(4*x)/2-(15/3)-3 = 0
(4*x)/2-5-3 = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x = 4
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