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One number is seven times one-half of another number. The numbers differ by 35. What are the numbers?

i dont understand how you would write this equation

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David W. | I'll help you understand math!I'll help you understand math!
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a = 7b/2
a - b = 35
 
Substitute!
 
7b/2 - b = 35
7b/2 -2b/2 = 35
5b/2 = 35
5b = 70
b = 14
 
a = 7(14)/2
a = 49