There can be no answer because there is no equation. There is an expression that can be simplified but that is not an answer.
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6x+4=3x+12 => 6x-3x=12-4 => 3x=8 => x=8/3=2.666...
3x + 5 = 6x + 23 -3x = 18 x = -6
3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
3x+50=6x+14 50-14=6x-3x 36=3x x=36 / 3 therefore x=12
5x^2 + 6x + 9 + (?) = -x^2 +3x + 3 (?) = -5x^2 -6x - 9 -x^2 +3x + 3 = -6x^2 -3x -6 Ans: -6x squared +3x -6