Answer :
Start with 6x + 2y = 15. Then subtract 6x + 2y from both sides. The left side of your equation then becomes 0 and the right side 15 - 6x - 2y.
Start with 6x + 2y = 15. Then subtract 6x + 2y from both sides. The left side of your equation then becomes 0 and the right side 15 - 6x - 2y.