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x in (-oo:+oo)
(-5/2)*(x+6)+(3/2)*x = -3 // + 3
(-5/2)*(x+6)+(3/2)*x+3 = 0
(3*x)/2-5/2*(x+6)+3 = 0
(-5/2*2*(x+6))/2+(3*x)/2+(2*3)/2 = 0
3*x-5/2*2*(x+6)+2*3 = 0
6-2*x-30 = 0
-2*x-24 = 0
(-2*x-24)/2 = 0
(-2*x-24)/2 = 0 // * 2
-2*x-24 = 0
-2*x-24 = 0 // + 24
-2*x = 24 // : -2
x = 24/(-2)
x = -12
x = -12
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