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(5*x+5)/10 = (4*x-4)/4 // - (4*x-4)/4
(5*x+5)/10-((4*x-4)/4) = 0
(5*x+5)/10+(-1*(4*x-4))/4 = 0
(4*(5*x+5))/(4*10)+(-1*10*(4*x-4))/(4*10) = 0
4*(5*x+5)-1*10*(4*x-4) = 0
60-20*x = 0
(60-20*x)/(4*10) = 0
(60-20*x)/(4*10) = 0 // * 4*10
60-20*x = 0
60-20*x = 0 // - 60
-20*x = -60 // : -20
x = -60/(-20)
x = 3
x = 3
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