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x in (-oo:+oo)
(1/3)*(x+4) = (1/5)*(x+2) // - (1/5)*(x+2)
(1/3)*(x+4)-((1/5)*(x+2)) = 0
(1/3)*(x+4)+(-1/5)*(x+2) = 0
1/3*(x+4)-1/5*(x+2) = 0
1/3*(x+4)-1/5*(x+2) = 0
2/15*x+14/15 = 0
2/15*x+14/15 = 0
2/15*x+14/15 = 0 // - 14/15
2/15*x = -14/15 // : 2/15
x = -14/15/2/15
x = -7
x = -7
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