56:х=(10+6):2. Х-340:10=12•5. 484:4+х=210

56:x = (10+6):2
56:x = 16:2
56:x = 8
x = 56:8
x = 7

x - 340:10 = 12*5
x - 34 = 60
x = 60 + 34
x =94

484:4 + x = 210
121 + x = 210
x = 210 - 121
x = 89