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5x+7=9

x-(521-41)=29

(623-295)-x=70

57-(32+10+x)=10

200-X+375=156



Răspuns :

5-x+7=9
5+7-9=x
12-9=x
3=x

x-(521-41)=29
x- 480 =29
x=29 +480
x=509

57-(32+10+x)=10
57- (42 + x) =10
42-x =10 + 57
42+x=67
x=67-42
x=45

200-x+375=156
200+375-156=x
x=419

(623-295)-x=70
328-x=70
328-70=x
258=x
5x+7=9
5x=2
x=2/5

x- 480=29
x=509

(623-295)-x=70
328 -x=70
-x=-258 => x= 258

57-32-10-x =10
15-x =10
-x=-5 =>x= 5