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q = 12
20. 4x - 12 -2x + 6 = 8
2x = 14
x = 7
21. 4x + 3x - 6 - 5 + 4x = 0
8x - 8 = 0
x = 1
22. 6x-9-2x-2 = x - 3
3x = 8
x = 2 2/3
23. 8y - 10y + 15 = 4y -12 + 18
21 = 6y
3 1/2 = y