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x in (-oo:+oo)
3/10 = (x+1)/15 // - (x+1)/15
3/10-((x+1)/15) = 0
(-1*(x+1))/15+3/10 = 0
(-1*10*(x+1))/(10*15)+(3*15)/(10*15) = 0
3*15-1*10*(x+1) = 0
35-10*x = 0
(35-10*x)/(10*15) = 0
(35-10*x)/(10*15) = 0 // * 10*15
35-10*x = 0
35-10*x = 0 // - 35
-10*x = -35 // : -10
x = -35/(-10)
x = 7/2
x = 7/2
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