Question

Ex 19 .Punctele b,c,d
Va rog!!!!

Answer 1

b)[3·(2x+3)+6·(2x+3)]:5=27
[6x+9+12x+18]:5=27
(18x+27)=27·5
18x+27=135
18x=135-27
18x=108
x=108:18
x=6

c) [3·(3x+5)+7]:26=5
(9x+15+7):26=5
9x+22=5·26
9x+22=130
9x=130-22
9x=108
x=108:9
x=12

d) 2·{27-2·[3x(42:6-3·2)]+3}=40
2·{30-2·[3x-(7-6)]}=40
2·{30-2·[3x-1]}=40
2·{30-[6x-2]}=40
2·{30-6x+2}=40
2·{32-6x}=40
64-12x=40
12x=64-40
12x=24
x=24:12
x=2