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x in (-oo:+oo)
8*x-(87/2) = 2*x // - 2*x
8*x-(2*x)-(87/2) = 0
8*x-2*x-87/2 = 0
6*x-87/2 = 0 // + 87/2
6*x = 87/2 // : 6
x = 87/2/6
x = 29/4
x = 29/4
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