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100
x = 29
x + 39 = 68
100
n = 4
10n = 40
100
x = 12
x - 5 = 7
100
b = 15
2b = -30
200
x = 8
x + 4 = 12
200
15x = 0
x = 0
200
x = 200
x - 120 = 80
200
-8=x
-24 = 3x
300
x = -30
30x + 30 = -60
300
x = 3
7x = 21
300
y = 32
y - 8 = 24
300
x = 5
4x = 20
400
x = -32
x + -24 = -56
400
x = 13
8x = 104
400
y = 2
2x - y = 2
400
x = 5
3x = 15