(у + 1490) ∙ 105 = 159600
105y + 105*1490 = 159600
105y + 156450 = 159600
105y = 159600 - 156450
105y = 3150
y = 3150:105
y = 30
(у + 1490) ∙ 105 = 159600
105y + 105*1490 = 159600
105y + 156450 = 159600
105y = 159600 - 156450
105y = 3150
y = 3150:105
y = 30