the quotient of 4 more than a number and 7 is 10

Take this algebraic expression in pieces:

The phrase a number means an arbitrary variable, let's call it x.
x

4 more than a number means we add 4 to x:
x + 4

The quotient of 4 more than a number and 7 means we divide x + 4 by 7
(x + 4)/7

The word is means an equation, so we set (x + 4)/7 equal to 10
(x + 4)/7 = 10

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