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6 and 9 both go into 54.
9 and 13 both go into 117.
If your stuck go for the lowest common multiple, multiply 6x9 and then you have a number that is divisible by both. (54)
2x + 6 = -9 + 5x Subtract 2x from both sides: 6 = -9 + 3x Add 9 to both sides: 15 = 3x Divide both sides by 3: 5 = x
5x/6 = -9/6Multiply both sides of the equation by 6:5x = -9Divide both sides by 5:x = -9/5