Odpowiedź:
a)
3 (x+5) + 14 + 2 (x-3) - 8 (x+1)=0
3x + 15 + 14 + 2x - 6 - 8x + 8 = 0
3x + 31 = 0
3x = -31
x= 10,3
b)
x-2/7 = x-7/2
14 * x-2/7 = 14 * x-7/2
2x - 14 = 7x - 49
49 - 14 = 7x - 2x
35 = 5x
x = 7
