x= -11
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minus 4 plus 9 = 5, so 5x
4x - 10 + 5x = 719x = 81x = 9
5x+12 = 4x-88 x = -100
5x - 18 = 4x + 7Add 18 to each side:5x = 4x + 25Subtract 4x from each side:x = 25
5x + 3 = 4xSubtract 3 from each side:5x = 4x - 3Subtract 4x from each side:x = -3