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Three times a the sum of a number and 7 is 45

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1 Answer

Let n = the unknown number
 
Three times the sum of a number (n) and 7 is 45
 
The sum of the number (n) and 7: n+7
 
Three times the sum of the number and 7: 3(n+7)
 
Three times the sum of a number and 7 is 45: 3(n+7)=45
 
Distribute the 3 across the terms in the parentheses:
 
3(n + 7) = 45
3n + 21 = 45
 
Solve for n