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x in (-oo:+oo)
(1/2)*(x+8)+(3/2)*x = 2 // - 2
(1/2)*(x+8)+(3/2)*x-2 = 0
1/2*(x+8)+(3*x)/2-2 = 0
(1/2*2*(x+8))/2+(3*x)/2+(-2*2)/2 = 0
1/2*2*(x+8)+3*x-2*2 = 0
4*x-4+8 = 0
4*x+4 = 0
(4*x+4)/2 = 0
(4*x+4)/2 = 0 // * 2
4*x+4 = 0
4*x+4 = 0 // - 4
4*x = -4 // : 4
x = -4/4
x = -1
x = -1
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