$$3\cdot(2+8) = 3x\cdot2$$
Answer
$$ x = 5 $$
Explanation
$$ \begin{aligned} 3\cdot(2+8) &= 3x\cdot2&& \text{simplify left and right hand side} \\[1 em]3\cdot10 &= 6x&& \\[1 em]30 &= 6x&& \text{ swap the left and right side of the equation } \\[1 em]6x &= 30&& \text{ divide both sides by $ 6 $ } \\[1 em]x &= \frac{30}{6}&& \\[1 em]x &= 5&& \\[1 em] \end{aligned} $$
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