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(2/3)*(7-(4*x))-x = 1/2-(2*x) // - 1/2-(2*x)
(2/3)*(7-(4*x))-x+2*x-(1/2) = 0
(2/3)*(7-4*x)-x+2*x-1/2 = 0
2/3*(7-4*x)-x+2*x-1/2 = 0
(2/3*2*(7-4*x))/2+(2*(-x))/2+(2*2*x)/2-1/2 = 0
2/3*2*(7-4*x)+2*(-x)+2*2*x-1 = 0
4*x-22/3*x-1+28/3 = 0
28/3-10/3*x-1 = 0
25/3-10/3*x = 0
(25/3-10/3*x)/2 = 0
(25/3-10/3*x)/2 = 0 // * 2
25/3-10/3*x = 0
25/3-10/3*x = 0 // - 25/3
-10/3*x = -25/3 // : -10/3
x = -25/3/(-10/3)
x = 5/2
x = 5/2
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