Найдите корень уравнения
1) 0,9 x - 0.6(x-3) = 2(0,2x - 1,3)
2) -0,4(3x - 1) + 8(0,8x - 0,3) = 5 - (3,8x + 4)
3) 4/7 (0,56 - 4,2y) + 0,4 = 5/13 (0,52 - 6,5y)
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