Question

x-234=659+124
983-59+y=406
x-218=677+23
(349+56)-y=12

Answer 1

983-59+у=406
у=406-983+59
у= - 518

х-218=677+23
х=677+23+218
х=918

(349+56)-у=12
349+56-12=у
у=393