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x in (-oo:+oo)
-((2/3)*x)-10 = -40/3 // + -40/3
-((2/3)*x)-(-40/3)-10 = 0
(-2/3)*x+40/3-10 = 0
10/3-2/3*x = 0 // - 10/3
-2/3*x = -10/3 // : -2/3
x = -10/3/(-2/3)
x = 5
x = 5
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