5,732+(х+7,269)=645

х+7,269=645-5,732

х+7,269=639,268

х=639,268-7,269

х=631,999

проверка

5,732+(631,999+7,269)=645

5,732+639,268=645

645=645

Verified answer

5,732+(х+7,269)=645
x+7.269=645-5.732
x+7.269=639.268
x=639.268-7.269
x=631,999