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Best Answer

5X + 7 = 42

subtract 7 from each side

5X + 7 - 7 = 42 - 7

5X = 35

divide both sides integers by 5

(5/5)X = 35/5

X = 7

----------check in original equation

5(7) + 7 = 42

35 + 7 = 42

42 = 42

--------------checks

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Q: 5x plus 7 equals 42
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