Question

253-(x-459)=138,502 -(217-x)=421,871-(x+157)=385

Answer 1

253-(x-459)=138
253-х+459=138
-х=138-253-459
-х=-574
х=574
502 -(217-x)=421
502-217+х=421
х=-502+217+421
х=136
871-(x+157)=385
871-х-157=385
-х=385-871+157
-х=-329
х=329