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ok, if the given sequences of equations is correct, then y=3x-3, you can substitute for y in the this equation: y=2x+5y
(3x-3)=2x+5(3x-3) => (3x-3) = 2x + 15x - 15
3x-3 = 17x -15
14x = 12
x = 12/14
now you can substitute back in the equation y=3x-3