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b) 3+x/3=4 |*3
9+x=12
x=12-9
x=3
zad7
a)3(x-5)=9 b)4(x+1)= -8
3x-15=9 4x+4= -8
3x=9+15 4x= -8-4
3x=24 |/3 4x= -12 |/4
x=8 x=-3
zad8
a) 2x+5+x-2=12
3x+3=12
3x=12-3
3x=9 |/3
x=3
b)-3x-1+5x+7=0
2x+6=0
2x=0-6
2x=-6 |/2
x= -3
c)4x+7-x+2=9
3x+9=9
3x=9-9
3x=0|/3
x=0
Mam nadzieję, że pomogłam.