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x - 3x + 7 = 28

Collect the x together: x - 3x = (1-3)x = -2x

→ -2x + 7 = 28

Collect the numbers together - subtract 7 from both sides

→-2x = -21

Divide both sides by -2 to get what one x is:

x = -10.5

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7y ago

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