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x in (-oo:+oo)
-21 = (-2/3)*x-5 // - (-2/3)*x-5
5-((-2/3)*x)-21 = 0
(2/3)*x-21+5 = 0
2/3*x-16 = 0 // + 16
2/3*x = 16 // : 2/3
x = 16/2/3
x = 24
x = 24
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