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x in (-oo:+oo)
(1/2)*(x-4)+(2/3)*x = x-4 // - x-4
(1/2)*(x-4)+(2/3)*x-x+4 = 0
1/2*(x-4)+(2*x)/3-x+4 = 0
(1/2*3*(x-4))/3+(2*x)/3+(3*(-x))/3+(3*4)/3 = 0
1/2*3*(x-4)+2*x+3*(-x)+3*4 = 0
7/2*x-3*x-6+12 = 0
1/2*x-6+12 = 0
1/2*x+6 = 0
(1/2*x+6)/3 = 0
(1/2*x+6)/3 = 0 // * 3
1/2*x+6 = 0
1/2*x+6 = 0 // - 6
1/2*x = -6 // : 1/2
x = -6/1/2
x = -12
x = -12
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