What is the value of x in the equation 3x – 1/9y = 18, when y = 27?
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3x- 27/9 = 18
3x - 3 = 18
adding 3 to both sides
3x - 3+3 = 18 + 3
3x = 21
divide both sides by 3
3x/3 = 21/3
X = 7
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