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x=-2*7=-14
b) 5y=13
y=13/5
c) -3/4z=3/4
z=3/4* (-4/3)=-1
d) -1/6u=1/3
u=1/3 * (-6)= -6/3= -2
e) y*12=-60
y=-60/12=-5
f) -2w= -1/2
w=(-1/2)/(-2)=1/4
g) 5a=0
a=0
h) -7b=7/8
b=(7/8)/(-7)=1/8
i) 22(-c) = -66
-c=-66/22
-c=3 obustronnie pomnożyć lub podzielić(obojętne to jest) przez -1
c=-3
1/2 to ułamek zwykły