253-(х+459)=138
253-138+459=х
x=574
502-(217-х)=421
502-217+х=421
х=421-502+217
х=136
871-(х+157)=385
х+157=871-385
х+157=486
х=486-157
х=329
253-(×+157)=385
253-×-157=385
253-157-385=×
×=-289
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Answers & Comments
253-(х+459)=138
253-138+459=х
x=574
502-(217-х)=421
502-217+х=421
х=421-502+217
х=136
871-(х+157)=385
х+157=871-385
х+157=486
х=486-157
х=329
253-(×+157)=385
253-×-157=385
253-157-385=×
×=-289