Find the step with mistake :
0=0
25-25= 20-20
5(5-5)= 4(5-5)
4=5
2+2= 5
tomboy4:
there seems no mistake
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1
no mistake found ............
no there is a mistake in the third step . the bracket may be simplified to 0 and it would then bring the answer 0=0
according to mathematicians,a(a-b) is not possible until a isn't equal to b
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