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(1/2)*(2*x+4)+4*x = 4*((9*x)/2+(3*x)/4) // - 4*((9*x)/2+(3*x)/4)
(1/2)*(2*x+4)-(4*((9*x)/2+(3*x)/4))+4*x = 0
(1/2)*(2*x+4)-4*((9*x)/2+(3*x)/4)+4*x = 0
1/2*(2*x+4)-4*21/4*x+4*x = 0
1/2*(2*x+4)-4*21/4*x+4*x = 0
4*x-20*x+2 = 0
2-16*x = 0
2-16*x = 0
2-16*x = 0 // - 2
-16*x = -2 // : -16
x = -2/(-16)
x = 1/8
x = 1/8
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