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(1/2)*(6-x)+3*x = (1/2)*x-8 // - (1/2)*x-8
(1/2)*(6-x)+3*x-((1/2)*x)+8 = 0
(1/2)*(6-x)+3*x+(-1/2)*x+8 = 0
1/2*(6-x)+3*x-x/2+8 = 0
(1/2*2*(6-x))/2+(2*3*x)/2-x/2+(2*8)/2 = 0
1/2*2*(6-x)+2*3*x-x+2*8 = 0
5*x-x+6+16 = 0
4*x+6+16 = 0
4*x+22 = 0
(4*x+22)/2 = 0
(4*x+22)/2 = 0 // * 2
4*x+22 = 0
4*x+22 = 0 // - 22
4*x = -22 // : 4
x = -22/4
x = -11/2
x = -11/2
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