ДАЮ 45 БАЛЛОВ   
1)(39+x)-84=78 3)(600-x)-92=126 4)253-(x-459)=138 2)(x-83)+316=425 5)502-(217-x)421 3)(600-x)-92=126 6)871-(x+157)=385 4)(у-164)+308=500 5)(942-a)-126=254 6)(801-b)-92=126 7)475-(671)=325 8)972(у-504)=284 9)403-(634-а)=366 10)643-(581-b)=292 11)987-(х+364)=519 12)3128-(м+425)=1509 
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