2 ⋅ (x + 6) + 2x = 48 2x + 12 + 2x = 48 4x = 48 – 12 4x = 36 x = 9 см
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2 ⋅ (x + 6) + 2x = 48 2x + 12 + 2x = 48 4x = 48 – 12 4x = 36 x = 9 см