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x in (-oo:+oo)
x/5-((2*x-8)/10) = 7*x-2 // - 7*x-2
x/5-((2*x-8)/10)-(7*x)+2 = 0
x/5-((2*x-8)/10)-7*x+2 = 0
(-1*(2*x-8))/10+x/5-7*x+2 = 0
(-1*5*(2*x-8))/(5*10)+(10*x)/(5*10)+(-7*5*10*x)/(5*10)+(2*5*10)/(5*10) = 0
10*x-1*5*(2*x-8)-7*5*10*x+2*5*10 = 0
40-350*x+100 = 0
140-350*x = 0
(140-350*x)/(5*10) = 0
(140-350*x)/(5*10) = 0 // * 5*10
140-350*x = 0
140-350*x = 0 // - 140
-350*x = -140 // : -350
x = -140/(-350)
x = 2/5
x = 2/5
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