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x in (-oo:+oo)
(1/2)*(x+8)+(3/2)*x = 10 // - 10
(1/2)*(x+8)+(3/2)*x-10 = 0
1/2*(x+8)+(3*x)/2-10 = 0
(1/2*2*(x+8))/2+(3*x)/2+(-10*2)/2 = 0
1/2*2*(x+8)+3*x-10*2 = 0
4*x-20+8 = 0
4*x-12 = 0
(4*x-12)/2 = 0
(4*x-12)/2 = 0 // * 2
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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