la ex 1,2,3,4 va rog repede

Răspuns:
1) x=scazator
9000-x=7342
x=9000-7342
x=1658
2)x=descazut
x-9385=4859
x=14244
3)x=numarul la care ma gandesc
x+7838=30000
x=30000-7838
x=22162
4)x=numar la care ma gandesc
x-6848=395
x=6848+395
x=7243