I add 12 to a number and then double their sum. The result is one and a half times what I get when I double the original number and add 12. Find the number
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Let the number be x
ATP
2(12+x) = 1½(24+2x)
=) 24+2x = 3/2(24+2x)
=) 24+x = 36+3x
=) 24-36 = 3x-x
=) -12 = 2x
=) -12/2 = x
=) -6 = x
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