![]() So this mass over here must be equal to this total mass. And we see that the scale is balanced, not tilting down or upwards. We can simply count them: Fourteen blocks, each has a mass of 1 kg, Now, let us think about what we have on the right-hand side. That is what we have on the left-hand side. So one way to think about the total mass on the left-hand side is 3x + 2. We have 3x and then we have 2 masses of 1 kilogram, So let's think about what we have on the left side: we have 3 masses with mass X, so you can say I will give you a few seconds to think about it. ![]() That equates what we have on the left hand, with what we have on the right side of the scale. But before we even do that, I want you to think about a mathematical equation that can represent what is going on Now, we are going to figure out what X is. Over here, actually, we have two of them. ![]() These three blue things, we also have some of the 1kg masses Not only do we have these identical unknown masses with mass X, Now we mixed up things a little bit more: on the left side of the scale,
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