Odpowiedź:
A)9x+7=3x
9x-3x=-7
6x=-7 /:6
x=-1,1(6)
b)2x+7=29-2x
2x+2x=29-7
4x=22 /:4
x=5,5
C)3-7x=4x-19
-7x-4x=-19-3
-11x=-22 /(-11)
x=2
D)5x+7=3x+18
5x-3x=18-7
2x=11 /:2
x=5,5
E)2(x+6)=28-2x
2x+12=27-2x
2x+2x=27-12
4x=15 /:4
x=3,75
F)2(x+2)=5-(x-1)
2x+4=5-x-1
2x+x=5-1-4
3x=0
G)-4+4(2-5x)=-9
-4+8-20x=-9
-20x=-9+4-8
-20x=-13 /:(-20)
x=-0,65
H)5x+4/3=-12
5x=-12-4/3
5x=-13(3) /5
x=2,(6).
I)x+2/9+x-1/3=1
x+x=1-2/9+1/3
2x=11/9 /2
x= 5/9
J)2x-3x-5/4=-1/4x-1
2x-3x+1/4x=-1+5/4
-3/4x=1/4 /:(-3/4)
x=1/3