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6x - 4y
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its 10x +9y +1z
6x plus 3y minus 2x plus 5y equals 4x plus 8y.
10x - 3y + 2x - 4y =(10x + 2x) + (-3y - 4y) =12x - 7y
(4, -7)
x/5y + 2x/3y = 3x/15y + 10x/15y = 13x/15y