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6x - 2 + 6y - 9 = 4
6x + 6y -11 = 4
6x + 6y = 4 + 11
6x + 6y = 15
6x - 2 + 6y - 9=4
6x + 6y = 4 + 11
6x + 6y = 15
b.) 15x + 4y = 33
c.) 40x + 2y = 19