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30x - 10x = 80 - 30
20x = 50
x = 50/20
x = 5/2
-4x + 17 = 6x - 18
6x + 4x = 17 + 18
10x = 35
x = 35/10
x = 7/2
4x + 12 = 104 + 3x
4x - 3x = 104 + 12
x = 116
33 - 11x = 30 - 20x
20x - 11x = 30 - 33
9x = -3
x = -3/9
x = -1/3