The given terms can be simplified to: 20x+20
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9x2 - 28x + 20 = 9x2 - 18x - 10x + 20 = 9x(x - 2) - 10(x - 2) = (9x - 10)*(x - 2)
x - 10x = 9x, so 9x + 3 = 0, so 9x = -3 so x = -1/3
-10x+3 = -x+12 -10x+x = 12-3 -9x = 9 x = -1
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If you mean 9x+x then it is 10x when simplified