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cât este x-2.[5x-7] egal350

Răspuns :

x-2·[5x-7] = 350 
x-10x - 14 = 350 
-9x - 14 =350 
-9x = 350+14
-9x =364
x= 364:9 
x= 40 
x-2 ×[5x-7] =350
 x-10x+14 =350
-9x=336
x=-336/9
x=-112/3
x=-37,(3)


verificare
-112/3 -2 ×[5 ×(-112/3 -7] =-112/3 +1120/3+14 =(-112+1120+42)/3=1050/3=350