Решите уравнения - a)3x - x + 5x = 2.1 б)x + 1.2x - 3.6x = -7 в)3y -11 = 1 - 2y г)2(y + 2) = -3(y-1) д)4(x-5) - (7x + 9) = 1 е)2x - 3(4-x) = 5-(x-1) ж)1/3x + 2 ( 2/3x - 1/6 ) = -1 1/6 з)0.4(3x - 0.5) = 1.5x + 0.2 ( x+1)