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c)3a+4=a-1+a+7
3a=2a+2
a=2
Zad.4/176
a)0,1x+0,2=-0,3
0,1x=-0,5 / *10
x=-5
b)0,25x+0,4=0,35
0,25x=-0,05 / *100
25x = -5 / :25
x=-5/25
x=-0,2
c)1-0,2x=-0,3x
1=-0,1x / * (-10)
x=-10
d)0,01x-1=0,1x-0,1
-0,09x=0,9 / *(-100)
x=-90