"Combine like terms" means you have to join 2 or more similar terms into one term. Doing this can simplify an equation or expression. For example,
10x+3+7x
10x and 7x are like terms. Therefore, the coefficients 10 and 7 can be added together. So:
10x+3+7x=17x+3
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In any terms it is a combining form meaning 'three'
If you have a expression that goes; 2x + 5x etc etc Simplifying the like terms is 7x 2x and 5x are like terms, but 2y and 2x are not. The variable needs to be the same.
If you mean: 4+5z+3-8 then it is 5z-1
It means to rewrite the expression so that it is in its simplest form. You can do this by combining like terms. For example: The equation 2x + 3x = 5 can be simplified to 5x = 5 by combining the "x's".
That equals x.