(4,2y - 3.96) * 1.5 = 8.55;
4.2y - 3.96 = 8.55 : 1.5;
4.2y - 3.96 = 5.7;
4.2y = 5.7 + 3.96;
4.2y = 9.66;
y = 9.66 : 4.2;
y = 2.3.
(4,2y - 3.96) * 1.5 = 8.55;
4.2y - 3.96 = 8.55 : 1.5;
4.2y - 3.96 = 5.7;
4.2y = 5.7 + 3.96;
4.2y = 9.66;
y = 9.66 : 4.2;
y = 2.3.