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.
In this lesson, we learn how to solve a two step equation with a rational term by using the reverse order of operations. It's important to pay attention to the sign being added, as adding a negative number is the same as subtracting. By adding or subtracting to obtain zero and multiplying by the inverse operation, we can solve for x. Showing our work and using the inverse operation is crucial to avoid making mistakes.
Solving a two step equation with a rational term
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Questions answered by this video:
How do I solve 2 step equations when the x term is divided by something?
How do I solve -4 +(x/3)=12?
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This lesson shows how to solve a two step equation when there is a rational term in the equation.