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x in (-oo:+oo)
-((1/3)*x)-2/3 = -8/15 // + -8/15
-((1/3)*x)-2/3-(-8/15) = 0
(-1/3)*x-2/3+8/15 = 0
-1/3*x-2/15 = 0 // + 2/15
-1/3*x = 2/15 // : -1/3
x = 2/15/(-1/3)
x = -2/5
x = -2/5
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