1/2 (3x + 1 + x - 3) = 1/2 (4x - 2) = 2x - 1
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I think you mean (3x ± 1)^2 = (3x+1)(3x-1)?
3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
If you mean 3x+4y = 12 then y = -3/4x +4
you mean: x+3x+3=x+18 so x=5
Let the symbol ^ mean "to the power" Then 9x^2 + 24x + 16 = (3x + 4)(3x +4) = (3x + 4)^2