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x in (-oo:+oo)
4-((2/3)*x) = -11 // + 11
4-((2/3)*x)+11 = 0
(-2/3)*x+4+11 = 0
15-2/3*x = 0 // - 15
-2/3*x = -15 // : -2/3
x = -15/(-2/3)
x = 45/2
x = 45/2
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