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3x2 + 10x + 3 = (x + 3)(3x + 1).
-10x+3 = -x+12 -10x+x = 12-3 -9x = 9 x = -1
(x2+10x+21)/(x+3) = (x+7)
4x-3+6x+3 4x+6x=10x -3+3=0 10x is the answer!
2x-3 = 21+10x 2x-10x = 21+3 -8x = 24 x = -3