Найдите ошибки, добущенные при ракритие скобок: 1) -(5х-4) = -5х - 4;
2) -2(х+2)= 6х-2;
3) -2(3х-2) = 6х-2;
4) -(-5-х) +2(3-4) = 5-х+6-4х. 
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