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12x + 6=9x + 27

12x-9x + 6=9x - 9x + 27 subtract 9x from both sides.

3x + 6 = 27 simplify

3x + 6 - 6=27 - 6 subtract 6 from both sides.

3x=21 simplify

3x/3=21/3 divide both sides by 3

x=7 simplify

12(7) + 6=>84+6=>90

9(7) + 27=>63+27=>90

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