Forming equations

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Kelly has twice as many sisters as Jenny. Given that Kelly has 6 sisters, which equation is correct?

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Sam buys 3 packets of sweets, each packet contains x sweets. Sam gives 2 sweets to a friend. Given that Sam now has 28 sweets, which equation is correct?

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Rachel buys 4 packets of seeds, each packet contains x seeds. Rachel also finds 7 seeds at home. Given that Rachel has a total of 55 seeds, which equation is correct?

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Equation for a school trip with 6 minibuses, each with x pupils, last one with 5 empty seats, total 79 pupils.

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