In the context of mathematics, when you add two variables together, such as s + s, you are essentially combining the values of those variables. So, s + s equals 2s, which means you are adding the value of s to itself. Therefore, if we are looking at s + s = t, the expression simplifies to 2s = t.
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s is directly proportional to t
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2t
S = 3 st + 3t = 6 st = 6 - 3t s = (6 - 3t)/t = 6/t - 3