That depends entirely upon the (undefined) value of x. Therefore, this question is unanswerable.
426 + 238 = 664
265 + 426 = 691
426 + n = 751 n = 751 - 426 = 325 So, 426 + 325 = 751.
8x-4
3x + 2x - 8x + 2x = -x
x=1
It is 2x+(-2x) = 0
4
-2x + 6 + 22 = -2x + 28
14
6 + 2x + 5 = 11 + 2x
it equals 13X.