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x in (-oo:+oo)
x/10-((4-x)/14) = (4-x)/5-(3/10) // - (4-x)/5-(3/10)
x/10-((4-x)/14)-((4-x)/5)+3/10 = 0
(-1*(4-x))/14+(-1*(4-x))/5+x/10+3/10 = 0
(-1*5*10*(4-x))/(5*10*14)+(-1*10*14*(4-x))/(5*10*14)+(5*14*x)/(5*10*14)+(3*5*14)/(5*10*14) = 0
5*14*x-1*5*10*(4-x)-1*10*14*(4-x)+3*5*14 = 0
190*x+70*x-760+210 = 0
260*x-760+210 = 0
260*x-550 = 0
(260*x-550)/(5*10*14) = 0
(260*x-550)/(5*10*14) = 0 // * 5*10*14
260*x-550 = 0
260*x-550 = 0 // + 550
260*x = 550 // : 260
x = 550/260
x = 55/26
x = 55/26
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