Răspuns :
Răspuns:
a) 9(x-1)=7(x+3)
9x-9=7x+21
9x-7x=21+9
2x=30=>x=30:2=>x=15
________
b) 12(x+1)=10·18
12x+12=180
12x=180-12
x=168:12=>x=14
__________
c) 20(x+4)=15(3x+2)
20x+80=45x+30
80-30=45x-20x
25x=50=>x=2
________
d) 3(x-3)=2x+1
3x-9=2x+1
3x-2x=1+9
x=10