Odpowiedź:
1) x-4=17 /+4
x = 21
2) x+1,3=2,7 /-1,3
x = 1,4
3) 5x+13=23 /-13
5x = 10 /:5
x = 2
4)-6x-3=-15 /+3
-6x = -12 /:(-6)
x = 2
5) 5x+2=7-3x /-2
5x = 5 - 3x /+3x
8x = 5
x = 0,625
6) 3(x-1)+2=8
3x - 3 + 2 = 8 /+1
3x = 9 /:3
x = 3
7) -2(4-5x)=3(4x+3)
-8 + 10x = 12x + 9 /+8
10x = 12x + 17 /-12x
-2x = 17 /:(-2)
x = -8,5
8) 2x+3 = 2-x - x /+2x
4x + 3 = 2 /-3
4x = -1 /:4
x = -0,25