решить уравниния:
1) 4 * (13 - 3 * х) - 17 = - 5 х
2) (18 - 3х) - (4 + 2х) = 10
3) 14 - х = 0,5 (4 - 2х) + 12
4) 4х - 3 (20 - х) = 10х - 3 (11 + х)
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