Where is the error?
a + b = c / + a + b
2a 2 b = a + b + c /
2a-2c 2 b-2c = a + bc
2 (a + bc) = a + bc / (a \u200b\u200b+ bc) 2 = 1
Solution:
All the transformations of the equation a + b = c are correct, but the latter transformation is disallowed.
Why?
simple answer: a + bc is equal to zero, and how well we do not divide by zero.
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