First you need to divide !3x by 13. Whatever you do on one side of the equation you must do on the other side. So then you have to divde 6 by 13 too. then 13x divided by 13 cancels out so you are left with 6 divided by 13. so if you do your work correctly you should get the right answer.(I know it's confusing. I didn't get either at first.)
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x + 13x + 10x = 50 - 6
5x-13x+6=0 5x-13x=-6 -8x=-6 -8x/-8=-6/-8 x = 3/4
6x^2 -13x+6 = (3x-2)(2x-3) when factorized
42 + x2 = 13x ∴ x2 - 13x + 42 = 0 ∴ (x - 6)(x - 7) = 0 ∴ x ∈ {6, 7}
(3x + 2)(2x + 3)