a) [(3-x+4)×2+5]×3+5=170
[(7-x )×2+5]×3+5=170(adunam nr din paranteză)
( 14-2x+5 )×3+5=170
(19-2x)×3+5=170
57-6x+5=170
62-6x=170
-6x=170-62
-6x=108
x= -18
b) 643-[(x-162):5+159]=454
643-(x-162 / 5 +159)=454
643--x-162/5 -159=457
484-x-162/5=454
2420-(x-162)=2270
2420-x+162=2270
-x=2270-2583
-x=-312
x=312
Sper ca poti da coroana
