13x - 4x = 9
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7x-5+2x=3-4x+12 7x+2x-5=3+12-4x 9x-5=15-4x 9x+4x-5=15-4x+4x 13x-5=15 13x-5+5=15+5 13x=20 13x/13=20/13 x=20/13
If you mean 4x-13x = 2, then-9x = 2-9x/-9 = 2/-9x = -2/9
If you mean: 4x-6+5x = 13x-8 then it works out that x = 1/2 or 0.5
13x
-14x^2+13x-5