Odpowiedź:
5y=13 / : 5
y = 13 /5
y = 2[tex]\frac{3}{5}[/tex]
1/7x=-2 / : 1/7
x = -2/1 : 1/7
x = -2/1 * 7/1
x = - 14/1
x = -14
b/3=45 / * 3
b = 45 * 3
b = 135
7a+7=35 / -7
7a = 35 - 7
7a = 28 / : 7
a = 28/7
a = 4
2-2x=5 / -2
-2x = 5-2
-2x = 3 / : (-2)
x = -3/2
x = - 1[tex]\frac{1}{2}[/tex]
