a)

98 - (x - 32) = 15,

х - 32 = 98 - 15,

х - 32 = 83,

х = 83 + 32,

х = 115,

б)

356 + (x + 61) = 481,

х + 61 = 481 - 356,

х + 61 = 125,

х = 125 - 61,

х = 64

98-(x-32)=15

x-32=98-15

x-32=83

x=83+32

x=115

_

356+(x+61)=481

x+61=481-356

x+61=125

x=125-61

x=64