x+2y=13 has infinite answers, because you have two variables and only one equation.
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This means that 2y - 3 = 2y + 4 which is not possible.
-2y=x+8 is the answer
2y(x+2)=
x + 2y - 9 = 4 can be rewritten as x + 2y = 13, but this is as far as you can simplify it because you have two unknowns and one equation.
x = 3 and y = 2