To build the expression 7-3x, you simply subtract 3x from 7. The expression represents a constant (7) minus a multiple of a variable (3x).
This can be used to model a wide range of situations in algebra, such as linear equations and inequalities.
Here's how to build the expression 7-3x:
1. Start with the number 7.
7
2. Add the minus sign (-).
7 -
3. Write the variable "x" multiplied by 3.
7 - 3x
4. You have successfully built the expression 7-3x.