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It is 3x-36
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3x + 12 + 10x = 13x + 12
3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
(6-4x)(x-2)+3x =6x-12-4x+8x+3x =5x-4
6x+4=3x+12 => 6x-3x=12-4 => 3x=8 => x=8/3=2.666...
It is: 3x^2 +15x +12