Легкий пример! 486:(5х+2)=18
18( 5x + 2) = 486 90x + 36 = 486 90x = 486 - 36 90x = 450 x = 450/90 x = 5
486:(5х+2)=18 5х+2=486:18 5х+2=27 5х=27-2 5х=25 х=25:5 х=5 Ответ:5