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x in (-oo:+oo)
-((2/3)*x+4) = 10 // - 10
-((2/3)*x)-10-4 = 0
(-2/3)*x-10-4 = 0
-2/3*x-14 = 0 // + 14
-2/3*x = 14 // : -2/3
x = 14/(-2/3)
x = -21
x = -21
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