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x in (-oo:+oo)
5-((x+7)/8) = x/3 // - x/3
5-((x+7)/8)-(x/3) = 0
(-1*(x+7))/8-x/3+5 = 0
(-1*3*(x+7))/(3*8)+(8*(-x))/(3*8)+(3*5*8)/(3*8) = 0
8*(-x)-1*3*(x+7)+3*5*8 = 0
120-11*x-21 = 0
99-11*x = 0
(99-11*x)/(3*8) = 0
(99-11*x)/(3*8) = 0 // * 3*8
99-11*x = 0
99-11*x = 0 // - 99
-11*x = -99 // : -11
x = -99/(-11)
x = 9
x = 9
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