Răspuns:
a)12+4(4x-3)=6(3x-1)
12+16x-12=18x-6
16x=18x-6
16x-18x=-6
-2x=-6
x=3
b)15-7(3-6x)=9(5x-2)
15-21+42x=45x-18
-6+42x=45x-18
42x-45x=-18+6
-3x=-12
x=4
c)5(2x-3)=4(3x+7)-13
10x-15=12x+28-13
10x-15=12x+15
10x-15=15+15
-2x=30
x=-15
d)7(3x-4)+19=3(5x-7)
21x-28+19=15x-21
21x-9=15x-21
21x-15x=-21+9
6x=-12
x=-2
e)6(5-3x)=20-5(4+3x)
30-18x=20-20-15x
30-18x=-15x
-18x+15x=-30
-3x=-30
x=10
f)2(11-3x)=16-3(8-3x)
22-6x=16-24+9x
22-6x=-8+9x
-6x-9x=-8-22
-15x=-30
x=2
bafta!