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x in (-oo:+oo)
(1/2)*x+0.625*x-3 = 5 // - 5
(1/2)*x+0.625*x-5-3 = 0
1.125*x-8 = 0 // + 8
1.125*x = 8 // : 1.125
x = 8/1.125
x = 7.11111111
x = 7.11111111
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