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x in (-oo:+oo)
-((2/5)*x)-3 = -61/20 // + -61/20
-((2/5)*x)-(-61/20)-3 = 0
(-2/5)*x+61/20-3 = 0
1/20-2/5*x = 0 // - 1/20
-2/5*x = -1/20 // : -2/5
x = -1/20/(-2/5)
x = 1/8
x = 1/8
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