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Remember when you first learned your ABC's  you learned a is for apple, b is for ball, etc. Math also uses ABC's, but they are called variables.
1 always means 1 item, 5 always means 5 items
Variables value can change, not like numbers. That is why vary is the first part of their name . 
With Variables  Sometimes the value of the variable is given. Sometimes the value of the variable is not given. For example: The expression could say  simplify (think solve) for b = 9 1) 2b (submitting 9 for b) becomes 2(9) = 18 or The expression could say  simplify (think solve) 1) 7n + 5  4n  8 when like terms are combined becomes 3n  3 
Everything you can do with numbers you can do with variables, + Substituting c (a variable) for the cherry c + c = 2c 2 cherries  just like with numbers only If b = 3 bananas 2b would simplify into 2() or 6

If you had any problems in the past with adding, subtracting , multiplying or dividing whole numbers or decimals go back and review that material. 
If you had any problems in the past with fractions, especially multiplying or dividing, go back and review that material. Knowledge of fractions is useful when solving equations 
Polynomials 
Polynomials
Fraction Multiplication#on Working on 
Polynomials
Fraction Division working on 

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