CSMC 2021 Part A - Question 2, CEMC UWaterloo
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(Canadian Senior Mathematics Contest 2021, Part A, Question 2, CEMC - UWaterloo)
The operation $\triangledown$ is defined by $a \triangledown b = (a+1)(b-2)$ for real numbers $a$ and $b$. For example, $4 \triangledown 5 = (4+1)(5-2) = 15$.
If $5 \triangledown x = 30$, what is the value of $x$?
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