Question

determine o valor de x​

Answer 1

$\mathsf{180^{\circ}-x=\dfrac{140^{\circ}+60^{\circ}}{2}}\\\mathsf{180^{\circ}-x=\dfrac{200^{\circ}}{2}}\\\mathsf{180^{\circ}-x=100^{\circ}}\\\mathsf{x=180^{\circ}-100^{\circ}}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=80^{\circ}}}}}}$