a)2a-(4a-1)=4
2a-4a+1=4
-2a=4-1
-2a=3/(-2)
a=-3/2
spr. :L= 2*(-3/2)-[4*(-3/2)-1]
L=-3+7
L=4
P=4
L=P
b)4= 4,5t - 2 (2k-3,5)
4=4,5t - 4t-7
4+7=0,5t
11=o,5t/0,5
t=22
spr: L=4
p=4,5*22-2(2*22 - 3,5)
P=226-2(44- 3,5)
P=226-2*40,5
P=226-81
P=145
L≠P
c)-(3d-6)+3(d2)= 1
-3d+6+6d=1
3d=-5/3
d=-5/3
spr: L=-[3(-5/3) - 6]+3[(-5/3)*2]
L=11-10
L=1
P=1
L=P