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a)
6=0,12x
x=50
b)
0,86y=40,42
y=47
c)
1,1a=143
a=130
d)
2,1a=23,1
a=11
8.
a)
(2x+7):2=20
x=6,5
b)
(5y+10):3=16
y=3,6
c)
15+y=51-y
y=18
10.
a)
4x+1=3x+5
x=4
b)
x-3+5=2(x-8)
x=18
c)
3(7x-1)=x+7
x=0,5
d)
x²+3-2=x(x-1)+2
x=-1