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1:54
Khan Academy
Sal Khan
One-step addition equation
In this math lesson, we learn to solve simple equations with one variable. We isolate the variable by removing other terms on the same side. For example, if a + 5 = 54, we subtract 5 from both sides to find a = 49. Finally, we check our solution by substituting the value back into the original equation.
Feb 20, 2011
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