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The question contains no equation (nor inequality) so there is nothing that can be solved.
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Multiply first equation by 1.5, giving 3x + 3y = 12, but we are told that 3x + 3y = 6. If there isn't an error in the question then 2 = 1!
2x + 3y = 9x = 3, y = 1 therefore 6 + 3 = 9
this can not be solved un less with another equation
Yes and it works out that x = 3 and y = 4
-4(7x-3y-z)-(-6)(9x-z+2)