x+452=1290
x=1290-452
x=838
515-x=25
x=515-25
x=490
768:x=192
x=768:192
x=4
x+452=1290
x = 1290 - 452 = 838
515-x=25
x = 515 - 25 = 490
768:x=192
x = 768 : 192 = 4
\(x+452=1290\)
\(x=1290-45\)
\(x=838\)
\(515-x=25\)
\(x=515-25\)
\(x=490\)
\(768:x=192\)
\(x=768:192\)
\(x=4.\)
x+452=1290
x=1290-452
x=838
515-x=25
x=515-25
x=490
768:x=192
x=768:192
x=4