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x in (-oo:+oo)
4-((2/3)*x) = -7 // + 7
4-((2/3)*x)+7 = 0
(-2/3)*x+4+7 = 0
11-2/3*x = 0 // - 11
-2/3*x = -11 // : -2/3
x = -11/(-2/3)
x = 33/2
x = 33/2
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