In the most general sense, "simplify" means to replace an expression with an equivalent expression that is simpler.
For example, 2x + 3x can be simplified as 5x (using the distributive property); x5x7 can be simplified as x12 (you may add exponents if the base is the same), etc.
The given expression in algebra can be simplified to 12b
8a-a-a = 6a
It is an expession that can be simplified to: 6c
z+3 simplified as much as possible
If you mean: -3*(-2b-3)+7b then it is an algebraic expression that can be simplified to 6b+9+7b = 13b+9
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Igual>>> ALGEBRA
In Algebra, "is" means Equal (=).
"And" in algebra usually means addition.
They are: x and y and the expression can be simplified to 6xy
If you are using the X to mean multiply, then the answer is -18. Otherwise, if this is algebra, and the X is a variable, then numbers against a variable always means to multiply, so it would simplify to -18X.
It usually refers to an introductory algebra class.