Set up your equation: X+9=15. Then subtract 9 from 15. You get 15-9=6. Your answer is 6.
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15x + 9
15,409 = fifteen thousand, four hundred nine.
Fifteen thousand four hundred nine.
Nine fifteen
To write 15.9 as words, you would say "fifteen point nine." This represents the whole number 15 followed by the decimal point and the fractional part 0.9, which is pronounced as "nine tenths."