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Best Answer
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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