Mastering Multi-Step Equations

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Tom has twice as many marbles as Jerry. If Tom gives 6 marbles to Jerry, they will both have 18 marbles. How many marbles did Tom have at first?

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A number is multiplied by 4, then 7 is subtracted, and the result is 21. What is the number?

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Lisa read 3 times as many pages on Monday as she did on Sunday. If she read 12 pages on Sunday and 15 pages on Tuesday, how many pages did she read in total?

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A number is increased by 9, then doubled, and the result is 34. What is the number?

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If you subtract 4 from a number and then multiply the result by 3, you get 27. What is the number?

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A store sold 5 more than twice as many shirts on Saturday as on Friday. If they sold 25 shirts on Saturday, how many shirts did they sell on Friday?

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