2 answers:
7x + 3y = -9
+9 +9
________________
7x + 3y + 9 = 0
-3y -3y
_______________
7x + 9 = -3y
(divide each side by negative 3)
7x 9
__ + __ = y
-3 -3
simplified it would be :
7x
__ - 3 = y
-3
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