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3x-4
4b+3=3b-4
4b-3b=-4-3
b=-1
7+3c=5+2c
3c+2c=5-7
5c=-2 |:5
c=⅖
5d+2=3d
5d-3d=2
2d=2 |:2
d=1
6e-2=7e+5
6e-7e=5+2
-e=7
6f-1=f+2
6f-f=2+1
5f=3 |:5
f=⅗
Tylko to zrobiłam bo tylko to potrafię ; ))