(iv) 3(x-1) =18
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answer is 7
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3(x-1) = 18
3x - 3 = 18
3x = 18 + 3
3x = 21
x = 21/3
x = 7
3x - 3 = 18
3x = 18 + 3
3x = 21
x = 21/3
x = 7
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