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100
2x = 8
x = 4
100
X^2 = 9
x = 3
200
8x + 4 = 2x + 28
x = 4
200
x^2 = 121
x = 11
300
7x - 3 = 18
x = 3
300
x^2 - 4 = 0
x = 2
400
5x - 9 = -3x + 71
x = 10
400
x^2 + 7x = 0
x = -7
500
-2x + 3 = -4x - 31
x = -16
500
x^2 + 6x = 4x - 1
x = -1