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(3/5)*(x-4)-2 = (1/10)*x-(3/20) // - (1/10)*x-(3/20)
(3/5)*(x-4)-((1/10)*x)+3/20-2 = 0
(3/5)*(x-4)+(-1/10)*x+3/20-2 = 0
3/5*(x-4)-x/10+3/20-2 = 0
(3/5*10*20*(x-4))/(10*20)+(20*(-x))/(10*20)+(3*10)/(10*20)+(-2*10*20)/(10*20) = 0
3/5*10*20*(x-4)+20*(-x)+3*10-2*10*20 = 0
100*x-480-400+30 = 0
100*x-450-400 = 0
100*x-850 = 0
(100*x-850)/(10*20) = 0
(100*x-850)/(10*20) = 0 // * 10*20
100*x-850 = 0
100*x-850 = 0 // + 850
100*x = 850 // : 100
x = 850/100
x = 17/2
x = 17/2
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