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-x-2x=4
-3x=4
x=-4/3
Dla x≥0
x-2x=4
-x=4
x=-4∉D
Odp. x=-4/3
-x - 2x = 4
-3x = 4 | : -3
x = -4/3
dla x≥0
x - 2x = 4
-x = 4 | : -1
x = -4 ∉ D
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