Explicație pas cu pas:
a) (X x3+47)- 315= 146
(3x+47)= 146+315
(3×+47)= 461
3x= 461-47
3x= 414
x= 414:3
x= 138
b) (x:6 -528) +307=517
(x:6 -528) =517-307
x:6=210+528
×:6=738
x= 738x6
×= 4428
c) (x:3-3)×9=306
(x:3-3)= 306:9
(×:3-3)= 34
x:3= 34+3
x:3= 37
x= 37x3
x= 111
d) (x:2)×3=30×3
(x:2)×3= 90
x:2=90:3
×:2=30
x= 30x2
x= 60
e)
(7x9-X×5)-27:9=20
(63-5x)-3=20
63-5x=20+3
63-5x=23
5x= 63-23
5x= 40
x= 40:5
x=8
