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How to Solve 3x + 5 = 20 Step by Step
A clear, cinematic guide demonstrating how to solve linear equations while keeping both sides balanced.
The idea
Explain step by step how to solve 3x + 5 = 20: subtract 5 from both sides to get 3x = 15, then divide both sides by 3 to get x = 5, and check it: 3 times 5 plus 5 is 20. Show each step of the equation on screen and why it keeps the two sides equal. Clear, patient narration for students.
What the video says
Think of an equation like a balance scale. We have three x plus five equals twenty, and we need to keep both sides equal to find x. First, let's get rid of that plus five. Subtract five from the left side. Then subtract five from twenty on the right, which gives you fifteen. Now three x equals fifteen. Next, we undo the multiplication. Since x is multiplied by three, divide both sides by three. Three x divided by three leaves x, and fifteen divided by three is five. So x equals five. Finally, let's check our work. Put five back into the equation. Three times five is fifteen, plus five equals twenty. It works!