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7z-6z=12-13
z=-1
F) -8t+17=4t-7
-8t-4t=-7-17
-12t=-24 /:(-12)
t=2
G) 14y-23=-y+12
14y+y=12+23
15y=35 /:15
y=2 5/35 (czyli, 2 i pięć trzydzieścipiątych)
: - dzielenie
7z-6z=12-13
z=-1
-8t+17=4t-7
-8t-4t=-7-17
-12t=-24/:(-12)
t=2
14y-23=-y+12
14y+y=12+23
15y=35/:15
y=35/15=7/3=2 i 1/3
Zad2
'x +1/3x+3/5x +2=31
x+ 5/15x+9/15x = 31-2
x+14/15x=29
29/15x=29/ * 15/29
x=15