5x + 3 - 4 + 4x = 9x -1
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If: 5x = 4x+7 Then: 5x-4x = 7 And: x = 7
5x - 4x = 13 - 3 ie x = 10
4x+12-5x-30=-x-18
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
4x - 3 - 5x + 7 = 6 4x - 5x = 3 - 7 + 6 -1x = 2 x = -2