[tex]\displaystyle\bf\\+\left \{ {{3x-7y=11} \atop {6x+7y=16}} \right. \\----------\\9x=27\\\\x=27:9\\\\\boxed{x=3}\\\\7y=3x-11=3\cdot 3-11=9-11=-2\\\\\boxed{y=-\frac{2}{7}} \\\\\\Otvet: \ \Big(3 \ ; \ -\frac{2}{7} \Big)[/tex]