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x = 1 + y
x/2 + y - 6/3 = 6
(1 + y)/2 + y - 6/3 = 6
3 + 3y + 6y - 12 = 6
3y + 6y = 6 - 3 + 12
9y = 15
y = 15/9
y = 5/3
x - y = 1
x - 5/3 = 1
x = 1 + 5/3
x = 1/1 + 5/3
x = 3/3 + 5/3
x = 8/3
x + y = 8/3 + 5/3
= 13/3
= 4 1/3