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x in (-oo:+oo)
(8*x+8)/7 = (x+3)/3 // - (x+3)/3
(8*x+8)/7-((x+3)/3) = 0
(8*x+8)/7+(-1*(x+3))/3 = 0
(3*(8*x+8))/(3*7)+(-1*7*(x+3))/(3*7) = 0
3*(8*x+8)-1*7*(x+3) = 0
17*x+3 = 0
(17*x+3)/(3*7) = 0
(17*x+3)/(3*7) = 0 // * 3*7
17*x+3 = 0
17*x+3 = 0 // - 3
17*x = -3 // : 17
x = -3/17
x = -3/17
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