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7x=8+13
7x=21
x=3
ad. b
3x-4x=-4
-x=-4/(-1)
x=4
ad.c
3x+3x=9-9
6x=0
x=0
ad. d
-27x-2x=59-1
-28x=58
-x=2 1/29
x=-2 1/29
ad. e
45x-19x=-45+19
26x=-26
x=-1
ad. f
82x+18x=1+9
100x=10
x=0.1
7x-13=8
7x=8+13=21/7
x=3
b)
3x-4=4x
3x-4x=4
-1x=4/-1
x=-4
c)
3x+9= (-3x)+9
3x+3x=9-9
6x=0
d)
(-27x)+1=2x+59
-27x-2x=59-1
-25x=58/-25
e)
45x-19=19x-45
45x-19x=-45+19
26x=-26/26
x=-1
f)
82x-9=(-18x)+1
82x+18x=1+9
100x=10/100
x=0,1
7x=8+13
7x=21/7
x=3
spr. 7*3-13=8
21-13=8
8=8
b) 3x-4=4x
3x-4x=4
-1x=4/-1
x=-4
spr. 3*(-4)-4=4*(-4)
-12-4=-16
-16=-16
c) 3x+9= (-3x)+9
3x +3x=9-9
x=0
d)(-27x)+1=2x+59
-27x -2x=59-1
-29x=58/(-29)
x=-2
spr. -27*(-2)+1=2*(-2)+59
55=55
e)45x-19=19x-45
45x -19x=-45+19
26x=-26/26
x=-1
spr. 45*(-1) - 19=19*(-1)-45
-45-19=-19-45
-26=-16
f)82x-9=(-18x)+1
82x+18x=1+9
100x=10/100
x=0.1