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x in (-oo:+oo)
x/4-((4*x-10)/5) = (7/10)*x // - (7/10)*x
x/4-((4*x-10)/5)-((7/10)*x) = 0
x/4-((4*x-10)/5)+(-7/10)*x = 0
(-1*(4*x-10))/5+x/4+(-7*x)/10 = 0
(-1*4*10*(4*x-10))/(4*5*10)+(5*10*x)/(4*5*10)+(-7*4*5*x)/(4*5*10) = 0
5*10*x-1*4*10*(4*x-10)-7*4*5*x = 0
400-110*x-140*x = 0
400-250*x = 0
(400-250*x)/(4*5*10) = 0
(400-250*x)/(4*5*10) = 0 // * 4*5*10
400-250*x = 0
400-250*x = 0 // - 400
-250*x = -400 // : -250
x = -400/(-250)
x = 8/5
x = 8/5
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