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6x + 9 = 18x -3x + 81
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6x + 9 = 18x -3x + 81

User Wallebot
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6x + 9 = 18x - 3x + 81
6x + 18x + 3x = -9 + 81
-9x = 72
x = 72 : (-9)
= -8
User Wojtek Majerski
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