Mathematics, 16.04.2020 00:37 jocelyn7575

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What is the justification for step 3 in the solution process?

10d − 5 = 4d − 15 − 3d
Step 1: 10d − 5 = d − 15
Step 2: 9d − 5 = -15
Step 3: 9d = -10

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What is the justification for step 3 in the solution process?
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