計方程(有過程)

3x + 4 = 19
3x + 4 -4 = 19 -4
3x = 15
3x/3 = 15/3
x = 5


2x - 7 = 13
2x - 7 +7 = 13 +7
2x = 20
2x/2 = 20/2
x = 10


4x - 11 = 1
4x - 11 +11 = 1 +11
4x = 12
4x/4 = 12/4
x = 3


5x + 14 = 24
5x + 14 -14 = 24 -14
5x = 10
5x/5 = 10/5
x = 2


16 - 3x = 7
16 - 3x -16 = 7 -16
-3x = -9
-3x/(-3) = -9x/(-3)
x = 3


53 - 6x = 29
53 - 6x -53 = 29 -53
-6x = -24
-6x/(-6) = -24/(-6)
x = 4


72 - 9x = 27
72 - 9x -72 = 27 -72
-9x = -45
-9x/(-9) = -45/(-9)
x = 5


13 = 48 - 7x
13 + 7x - 13 = 48 - 7x + 7x - 13
7x = 35
7x/7 = 35/7
x = 5


28 + 3x = 55
28 + 3x -28 = 55 -28
3x = 27
3x/3 = 27/3
x = 9

3x+4=19
3x=15
x=5

2x-7=13
2x=20
x=10

4x-11=1
4x=12
x=3

5x+14=24
5x=10
x=2

16-3x=7
-3x=-9
x=3

53-6x=29
-6x=-24
x=4

72-9x=27
-9x=-45
x=5

13=48-7x
-35=-7x
x=5

28+3x=55
3x=27
x=9

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3x+4=19
3x=19-4
3x=15
x=15/3
x=5

2x-7=13
2x=13+7
2x=20
x=20/2
x=10

4x-11=1
4x=1+11
4x=12
x=12/4
x=3

5x+14=24
5x=24-14
5x=10
x=10/5
x=2

16-3x=7
-3x=7-16
-3x=-9
x=-9/(-3)
x=3

53-6x=29
-6x=29-53
-6x=-24
x=-24/(-6)
x=4

72-9x=27
-9x=27-72
-9x=-45
x=-45/(-9)
x=5

13=48-7x
13-48=-7x
-35=-7x
x=-35/(-7)
x=5

28+3x=55
3x=55-28
3x=27
x=27/3
x=9