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3 tenths = 0.3 or 3/10
18-(3*d) or 18-3d
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Let x be the number and so it is: 3x-18
You write an equal sign; you write something to the left of the equal sign; and you write something to the right of the equal sign. For example: x = 3 x = y 3 = 3 0 = 4 1 + 2 = 5 etc.