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x in (-oo:+oo)
(3/5)*(x+8) = 9/2 // - 9/2
(3/5)*(x+8)-(9/2) = 0
(3/5)*(x+8)-9/2 = 0
3/5*(x+8)-9/2 = 0
(3/5*2*(x+8))/2-9/2 = 0
3/5*2*(x+8)-9 = 0
6/5*x+3/5 = 0
(6/5*x+3/5)/2 = 0
(6/5*x+3/5)/2 = 0 // * 2
6/5*x+3/5 = 0
6/5*x+3/5 = 0 // - 3/5
6/5*x = -3/5 // : 6/5
x = -3/5/6/5
x = -1/2
x = -1/2
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