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So far, it is known that the following it true:
y = 4x + 2y = 5x
To make the search for the solution easier, I'll assume that this is based on two different equations:
y = 4x + 2y
and
y = 5x
The first equation can be simplified like so:
y - y = 4x + 2y - y
0 = 4x + y
y = -4x
If you use substitution, the fact that y must equal either -4 times a number or 5 times a number can be used to find the following:
5x = -4x
5x + 4x = 0
9x = 0
x = 0
The only answer to this problem is x = 0 (zero).
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