x - x + 1 = 5 + x /· 3
3x - 3x + 3 = 15 + 3x
-3x = 12 /: (-3)
x = -4
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x - x + 1 = 5 + x /· 3
3x - 3x + 3 = 15 + 3x
-3x = 12 /: (-3)
x = -4
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