7/12x-0,5=1,25
5/6x-4,15=2,1
2,7+2/9y=4,3

7/12x = 1,25+0,57/12x = 1,75x = 1,75 ÷ 7/12x = 35/6x = 2,1 + 4,155/6x = 6,25x = 6,25 ÷ 5/6x = 7,52/9y = 4,3 - 2,72/9y = 1,6y = 1,6 ÷ 2/9y = 7,2