870. Найдите множество корней уравнения:
1) |x| + 5|x| – 40 = 4|х| ;
2) 100 - |х|= -49|x| + 124;
3) 6|x| - 2 |x| = 35 - 16 |x|;
4) 29|x|- 1|x|- 13 = -22|x|.
Помогите пж, дам 20 баллов!
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