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(2/3)*x-(7*(x-(1/2))) = -x-28 // + -x-28
(2/3)*x-(7*(x-(1/2)))+x+28 = 0
(2/3)*x-7*(x-1/2)+x+28 = 0
(2*x)/3-7*(x-1/2)+x+28 = 0
(-7*3*(x-1/2))/3+(2*x)/3+(3*x)/3+(3*28)/3 = 0
2*x-7*3*(x-1/2)+3*x+3*28 = 0
3*x-19*x+21/2+84 = 0
21/2-16*x+84 = 0
189/2-16*x = 0
(189/2-16*x)/3 = 0
(189/2-16*x)/3 = 0 // * 3
189/2-16*x = 0
189/2-16*x = 0 // - 189/2
-16*x = -189/2 // : -16
x = -189/2/(-16)
x = 189/32
x = 189/32
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