It looks like your equations should be:
x = 3y - 5
2x - y = 18
If this is the case, the equations turn out to be a big mess with lots of decimals/fractions.
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-2x+3y=-18
x = 12 y = 2 (12,2) satifies the equation
2x - 3y = 6 2x = 6 + 3y 2x - 6 = 3y : 3y = 2x - 6 y = 2/3x - 2
The quotient of 2x and 3y is = 6xy
(10, 2)