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7x=21/:7
x=3
7*3-13=21-13=8
b)3x-4=4x/-4x+4
-x=4/:(-1)
x=-4
3*(-4)-4=4*(-4)
-12-4=-16
-16=-16
c)3x+9=-3x+9/+3x-9
6x=0/:6
x=0
3*0+9=-3*0+9
9=9
d)-27x+1=2x+59/-2x-1
-29x=58/:(-29)
x=-2
-27*(-2)+1=2*(-2)+59
54+1=-4+59
55=55
e)45x-19=19x-45/-19x+19
26x=-26/:26
x=-1
45*(-1)-19=19*(-1)-45
-45-19=-19-45
-64=-64
f)82x-9=-18x-1/+18x+9
100x=8/:100
x=8/100
7x=13+8
7x=21/:7
x=3
7*3-13=8
21-13=8
8=8
l=p
b)3x-4=4x
3x-4x=4
-x=4/:(-1)
x=-4
3*(-4)-4=4*(-4)
-12-4=16
-16=16
c)3x+9=-3x+9
3x+3x=9-9
6x=0
x=0
3*0+9=-3*0+9
9=9
l=p
d)-27x+1=2x+59
-27x-2x=59-1
-29x=58/:(-29)
x=2
-27*2+1=2*2+59
55=63
e)45x-19=19x-45
45x-19x=-45+19
26x=26/:26
x=1
45*1-19=19*1-45
26=-26
f)82x-9=-18x=1
82x+18x=1+9
100x=10/:100
x=0,1
82*0,1-9=-18*0,1+1
-0,8=2,8
7x=21\:7
x=3 l=p
b)3x-4=4x
3x-4x=4
-x=4\*(-1)x=-4
c)3x+9=-3x+9
3x+3x=9-9
6x=0
x=0 l=p
d)-27x+1=2x+59
-27x-2x=59-1
-29x=58\:(-29)
e)45x-19=19x-45
45x-19x=-45+19
26x=-26\:26
x=-1 l=p
82x-9=-18x+1 82x-9=-18x-1
82x+18x=-1+9
82x+18x=1+9 100x=8\:100
100x=10\:100 x=0,08 l=p
x=0,1
ostatniego zadania napisalam dwie wersje ,z1 i -1,bo tam zakradl ci sie blad