${\displaystyle {\begin{array}{lr}{\boldsymbol {p}}=m{\boldsymbol {v}}&1)\\{\boldsymbol {F}}={\boldsymbol {\dot {p}}}&2)\\{\boldsymbol {F}}_{12}=-{\boldsymbol {F}}_{21}&3)\\\end{array}}}$

In your article, replace the image with:

<math>\begin{array}{lr}
    \boldsymbol p=m \boldsymbol v & 1)\\
    \boldsymbol F= \boldsymbol{\dot p} & 2)\\
    \boldsymbol F_{12}=-\boldsymbol F_{21} & 3)\\
\end{array}</math>

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