(х-83)+316=425 (600-х)-92=126
х-83=425-316 600-х=126+92
х-82=109 600-х=218
х=109+82 х=600-218
х=191 х=382
253-(х-459)=138 502-(217-х)=421
х-459=253-138 217-х=502-421
х-459=115 217-х=81
х=459+115 х=217-81
х=574 х=136
871-(х+157)=385
х+157=871-385
х+157=486
х=486-157
х=329
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(х-83)+316=425 (600-х)-92=126
х-83=425-316 600-х=126+92
х-82=109 600-х=218
х=109+82 х=600-218
х=191 х=382
253-(х-459)=138 502-(217-х)=421
х-459=253-138 217-х=502-421
х-459=115 217-х=81
х=459+115 х=217-81
х=574 х=136
871-(х+157)=385
х+157=871-385
х+157=486
х=486-157
х=329