5x + 10x doesn't need factorization as you can just add them up (5x+10x=15x). However, if you really want to, 5x+10x=5x(1+2)=5x(3)=15x
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(2x - 1)(5x + 8)
That would depend on the plus or minus value of 2 which has not been given.
6-3x = 5x-10x+10 6-3x = -5x+10 -3x+5x = 10-6 2x = 4 x = 2
(5x - 2)(25x^2 + 10x + 4)
5x * 2x = 10x^2