Alright, buckle up, buttercup. To factor the expression 7x + 21 - 14y, you first want to look for common factors within the terms. In this case, you can factor out a 7 from all the terms, leaving you with 7(x + 3 - 2y). And there you have it, all factored and ready to roll.
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Look for the GCF. 7, 14 and 21 all have 7 as a common factor. Divide that out.
7x divided by 7 = x
21 divided by 7 = 3
14y divided by 7 = 2y
7x + 21 + 14y = 7(x + 3 + 2y)
Without an equality sign the given terms of an expression can't be classed as an equation and so therefore an answer is not possible.
If: 3x-3 = 7x+21 Then: x = -6
x2 + 7x + 6 = (x + 6) (x + 1)
If you mean: x squared -7x +12 then it is (x-3)(x-4) when factored
(10x + 3)(x - 1)