Odpowiedź:
a) 8+5*x+2=-3*x+7+2*x
10+5x=7-x
5x+x=7-10
6x=-3 //6
x=-1/2
bo
8+5*(-1/2)+2=-3*(-1/2)+7+2*(-1/2)
8-2,5+2=1,5+7-1
7,5=7,5
b) 3*x-4+2*x=7*x-5+x
5x-4=8x-5
5x-8x=-5+4
-3x=-1 //-3
x=1/3
bo
3*1/3-4+2*1/3=7*1/3-5+1/3
-7/3=-7/3
c) x-2*x+3*x-4*x+...+9*x-10*x+11*x=6
6x=6 //6
x=1
d) x+3*x+5*x+...+17*x+19*x-25=50
100x-25=50
100x=50+25
100x=75 //100
x=0,75
