Пожалуйста решите и объясните почему так: 1. 3/4х +5/14х =31;
2. 3-4х/5 - 4-3х/3 =2х-5/9;
3. 5х+3/2 - 5х+2/9 = х-3/5 + 5х+4/3;
4. 2x-5/3 - 5x+4/2= 1-5x/4 + 5x+2/6;
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