You need two equations for substitution to work (Ex. x + y = 2). Here, the best I can give you is 9x + 3y = 15 ... 3y = 15 - 9x ... y = 5 + 3x
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It equals 285
-9
15 plus -3 equals 12 12 divided by -6 equals -2
-15 plus 20 is 5.
That equals 28