$$13+(13-10)x\cdot2 = 19$$
Answer
$$ x = 1 $$
Explanation
$$ \begin{aligned} 13+(13-10)x\cdot2 &= 19&& \text{simplify left side} \\[1 em]13+3x\cdot2 &= 19&& \\[1 em]13+6x &= 19&& \\[1 em]6x+13 &= 19&& \text{ move 13 to the right } \\[1 em]6x &= 19-13&& \\[1 em]6x &= 6&& \text{ divide both sides by $ 6 $ } \\[1 em]x &= \frac{6}{6}&& \\[1 em]x &= 1&& \\[1 em] \end{aligned} $$
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