Ex 4 urgent dau coroana !!!!

Ex 4 Urgent Dau Coroana class=

Răspuns :

A. 5x-6-3x-12=3x-15-7
-6-12+15+7=3x-5x+3x
-18+22= x
X= 4
B. 2(6x+15-4)-7-3
12x+30-8-7-3
12x=-30+8+7+3
12x=-30+18
12x=-12
X= -1
C. 10x-35-9x+24=9x-16-6x+10+13
X-35+24=3x-16+23
-35+24+16-23=3x-x
-18=2x
X= -9