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x in (-oo:+oo)
5*(x+4) = (5/2)*x-5 // - (5/2)*x-5
5*(x+4)-((5/2)*x)+5 = 0
5*(x+4)+(-5/2)*x+5 = 0
5*(x+4)+(-5*x)/2+5 = 0
(2*5*(x+4))/2+(-5*x)/2+(2*5)/2 = 0
2*5*(x+4)-5*x+2*5 = 0
5*x+10+40 = 0
5*x+50 = 0
(5*x+50)/2 = 0
(5*x+50)/2 = 0 // * 2
5*x+50 = 0
5*x+50 = 0 // - 50
5*x = -50 // : 5
x = -50/5
x = -10
x = -10
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