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x in (-oo:+oo)
-((4*x)/3) = 28 // - 28
-((4*x)/3)-28 = 0
(-4/3)*x-28 = 0
-4/3*x-28 = 0 // + 28
-4/3*x = 28 // : -4/3
x = 28/(-4/3)
x = -21
x = -21
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