You roll 2 six-sided dice. What is the probability of rolling a sum that is less
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so.. let's us eliminate, say "z" first, so for that, let's pick the 1s and 2nd equations there
so, that's our first two-variables resultant
let's pick other two, and again, eliminate the same "z" variable, this time, let's use the 2nd and 3rd equations
now, we have two two-variables equations, let's use them then
and say, we'll eliminate the "y" variable from them