Résoudre les cinq équations suivantes.
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3 + x = 1
3 + x = 1 <=> x = 1 - 3 <=> x = - 2
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-x - 2 = 2x + 1
-x - 2 = 2x + 1 <=> - x - 2x = 1 + 2 <=> - 3x = 3 <=> x = - 1
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-3x - 2 = 3 + 2x
-3x - 2 = 3 + 2x <=> - 3x - 2x = 3 + 2 <=> - 5x = 5 <=> x = - 1
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3(x - 4) = 6x + 5
3(x - 4) = 6x + 5 <=> 3x - 12 = 6x + 5 <=> 3x - 6x = 5 + 12 <=> - 3x = 17 <=> x = - 17/3
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-(x + 2) = 5x - 1
-(x + 2) = 5x - 1 <=> - x - 2 = 5x - 1 <=> - x - 5x = - 1 + 2 <=> - 6x = 1 <=> x = - 1/6