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5(x + 3) + 2x = 4x + 9 (1) 5x + 15 + 2x = 4x + 9 What justifies that step
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5(x + 3) + 2x = 4x + 9
(1) 5x + 15 + 2x = 4x + 9

What justifies that step

User Artberri
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1 Answer

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It is distribution. The 5 is distributed to the x and 3.
User Allel
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