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(1/5)*(x-4) = 5*x-(16*(1-x))-4 // - 5*x-(16*(1-x))-4
(1/5)*(x-4)+16*(1-x)-(5*x)+4 = 0
(1/5)*(x-4)+16*(1-x)-5*x+4 = 0
1/5*(x-4)+16*(1-x)-5*x+4 = 0
1/5*(x-4)+16*(1-x)-5*x+4 = 0
4-79/5*x-5*x+76/5 = 0
4-104/5*x+76/5 = 0
96/5-104/5*x = 0
96/5-104/5*x = 0
96/5-104/5*x = 0 // - 96/5
-104/5*x = -96/5 // : -104/5
x = -96/5/(-104/5)
x = 12/13
x = 12/13
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