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21=5x/5
x=4,2
b)8y=4*3.5
8y=14/8
y=1,75
c)5*10=6(6+t)
50=6+6t
6t=44/6
t=7.3
d)8*1=6.5(z-1)
8=6.5z-6.5
6.5z=1,5/6.5
z=15/65
e)5(2x-5)=4*3
10x-25=12
10x=37/10
x=3.7
f)10(9-3x)1.5*8
90-30x=12
-30x=78/-30
x=-2.6
Masz głąbie : DD