Упростить выражения: а)0,2(7а-6b)-0,3(3a-4b)=
б)2/7(1,4а-3 1/3b)-1,2(5/6а-0,5b)=
 Решить уравнения:
а)x+3,12=-5,43
б)1 3/14-y=2 7/10
в)0,6(x+7)-0,5(x-3)=6,8
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