what number must be subtracted from each of 9,11,15,and19 so that the difference will be proportional.
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Answer:
answer is 3
Step-by-step explanation:
9-x: 11-x :: 15-x: 19-x
9-x*19-x=11-x *15-x
171-19x-9x+x square= -11x-15x+165+x square
171-28x = -26x +165
2x=6
x=3
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