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4x - 6 + 2x + 7 - 5x = 9
6x - 5x + 1 = 9
x = 9 - 1
x = 8
b)
3y - 6 + 3y - 2y + 6 - 2y = 9
6y - 4y = 9
2y = 9
y = 9/2 = 4 1/2