You have two unknown variables, x and y.
You therefore need at least two independent equations to find a solution.
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x = 19
It is a linear equation in x. It has a solution, which is x = -5
It is also x = 5 8zx + 5 = 2j + 3 → 8zx + 2 = 2j → 4zx + 1 = j Which is the first equation, which has a solution x = 5.
x = -5
It is x = -5