[tex]\displaystyle\bf\\2a+7b=133 \Leftrightarrow 7b=133-2a \implies \mathcal{M}_7 -2a=\mathcal{M}_7 \implies 2a=\mathcal{M}_7 \implies \\a=\mathcal{M}_7,~dar~a~este~prim,~si~deci~cum~a~este~multiplu~de~7~prim\\\implies \boxed{\bf a=7}~.\\2\cdot7 +7b = 133 \Leftrightarrow 14+7b=133 | :7 \implies \boxed{\bf b=17}~.[/tex]
