Найдите корень уравнения:
а) 4(0,2х-7)-5(0,3+6)=5
б) 22,4( 5/16х-3/7)-35,1(9/13х-4/9)= -45,9
Упростите:
а) -3(0,2х+0,4у)+(1,6х+2,8у)2
б) 2/7(4 2/3m-1,4)-2/9(6m+2,7)
P.s. даю 50 баллов
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