At about the 1:22 mark, the teacher says adding a -4 is the exact same thing as subtracting a -4; he should have said adding a -4 is the same thing as subtracting a positive 4.
At about the 1:29 mark, the teacher says that 3+-4 is the same thing as x-4; he should have either said 3+-4 is the same as 3-4 or x+-4 is the same as x-4.
Solving a two step equation with a rational term
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