14 × 7 + 2x + 122 = 4 × ( 57 + 12 × 15 )
98 + 2x + 122 = 4 × ( 57 + 180 )
98 + 2x + 122 = 4 × 237
220 + 2x = 948
2x = 948 - 220
2x = 728
x = 728 : 2
x = 364