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x in (-oo:+oo)
(-5/2)*(x+4)+(3/2)*x = -6 // + 6
(-5/2)*(x+4)+(3/2)*x+6 = 0
(3*x)/2-5/2*(x+4)+6 = 0
(-5/2*2*(x+4))/2+(3*x)/2+(2*6)/2 = 0
3*x-5/2*2*(x+4)+2*6 = 0
12-2*x-20 = 0
-2*x-8 = 0
(-2*x-8)/2 = 0
(-2*x-8)/2 = 0 // * 2
-2*x-8 = 0
-2*x-8 = 0 // + 8
-2*x = 8 // : -2
x = 8/(-2)
x = -4
x = -4
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