That equation has no solution. There is no possible number
that's equal to 18 more than itself.
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5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
23
7
x = -1.2, y = -3
Do you mean: 5x + 9 - 7x + 6 = x - 18 If so, you can solve this question at this manner: -2x + 15 = x - 18 3x = -3 x = -1