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(1/2)*x+1/5 = 4*((4/5)*x-3) // - 4*((4/5)*x-3)
(1/2)*x-(4*((4/5)*x-3))+1/5 = 0
(1/2)*x-4*((4/5)*x-3)+1/5 = 0
x/2-4*(4/5*x-3)+1/5 = 0
(-4*2*5*(4/5*x-3))/(2*5)+(5*x)/(2*5)+(1*2)/(2*5) = 0
5*x-4*2*5*(4/5*x-3)+1*2 = 0
2-27*x+120 = 0
122-27*x = 0
(122-27*x)/(2*5) = 0
(122-27*x)/(2*5) = 0 // * 2*5
122-27*x = 0
122-27*x = 0 // - 122
-27*x = -122 // : -27
x = -122/(-27)
x = 122/27
x = 122/27
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