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x in (-oo:+oo)
(3/8)*(4*x+2) = 5 // - 5
(3/8)*(4*x+2)-5 = 0
3/8*(4*x+2)-5 = 0
3/8*(4*x+2)-5 = 0
3/2*x-17/4 = 0
3/2*x-17/4 = 0
3/2*x-17/4 = 0 // + 17/4
3/2*x = 17/4 // : 3/2
x = 17/4/3/2
x = 17/6
x = 17/6
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