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x in (-oo:+oo)
3-((5/8)*x) = 2*(x-4) // - 2*(x-4)
3-(2*(x-4))-((5/8)*x) = 0
(-5/8)*x-2*(x-4)+3 = 0
(-5*x)/8-2*(x-4)+3 = 0
(-2*8*(x-4))/8+(-5*x)/8+(3*8)/8 = 0
3*8-2*8*(x-4)-5*x = 0
24-21*x+64 = 0
88-21*x = 0
(88-21*x)/8 = 0
(88-21*x)/8 = 0 // * 8
88-21*x = 0
88-21*x = 0 // - 88
-21*x = -88 // : -21
x = -88/(-21)
x = 88/21
x = 88/21
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