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x in (-oo:+oo)
(13/10)*x+4/5 = (6/5)*x // - (6/5)*x
(13/10)*x-((6/5)*x)+4/5 = 0
(13/10)*x+(-6/5)*x+4/5 = 0
1/10*x+4/5 = 0 // - 4/5
1/10*x = -4/5 // : 1/10
x = -4/5/1/10
x = -8
x = -8
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