Sum of a number and 7 is subtracted from 15 the result is 6.
The phrase a number means an arbitrary variable, let's call it x.
We take this expression in pieces. Sum of a number and 7
x + 7
Subtracted from 15
15 - (x + 7)
The result is means an equation, so we set this expression above equal to 6
15 - (x + 7) = 6 <-- This is our algebraic expression
If the problem asks you to solve for x, we Group like terms
15 - x - 7 = 6
8 - x = 6
Type 8 - x = 6 into the search engine, and we get x = 2
The phrase a number means an arbitrary variable, let's call it x.
We take this expression in pieces. Sum of a number and 7
x + 7
Subtracted from 15
15 - (x + 7)
The result is means an equation, so we set this expression above equal to 6
15 - (x + 7) = 6 <-- This is our algebraic expression
If the problem asks you to solve for x, we Group like terms
15 - x - 7 = 6
8 - x = 6
Type 8 - x = 6 into the search engine, and we get x = 2