-3x-3x3x=50-2

$${\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{x}} = {\mathtt{50}}{\mathtt{\,-\,}}{\mathtt{2}} \Rightarrow {\mathtt{x}} = -{\mathtt{4}}$$

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$What do you mean by $ 3x3x \;\;?$$   

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