R) The following proot seems to show that 2-1. Place a check mark In the step In which the error occurs. Step 1: Let a =b a - ab Step 2: Multiply by Step 1 Step 2 a- - ab -h stract Step 4: (a-5)(a+h) - ba-h) Factor Step 3 Step 3 Step 4 (e-ka Ma- - Step 5: Divide by la-) Step 6: a+b=b Simplify Step 5 Step 6 Step 7: b+b=b Step 8: 2h = b Since a=b %3D Simplify Step 7 Step 8 Duido bu

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A:

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A: