54:(x-7)=31-22
54:(x-7)=9
x-7=54:9
x-7=6
x=6+7
x=13
(29-x)*2=45+7
раскроем скобки
58-2x = 45+7
-2x+6 = 0
2x-6 = 0
2x = 6
x = 3
54:(x-7)=31-22
54:(x-7)=9
x-7=54:9
x-7=6
x=6+7
x=13
(29-x)*2=45+7
раскроем скобки
58-2x = 45+7
-2x+6 = 0
2x-6 = 0
2x = 6
x = 3