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16/6 = (-2/3)*x // - (-2/3)*x
16/6-((-2/3)*x) = 0
(2/3)*x+16/6 = 0
2/3*x+8/3 = 0 // - 8/3
2/3*x = -8/3 // : 2/3
x = -8/3/2/3
x = -4
x = -4
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