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4/5 = (-2/3)*x-(1/2) // - (-2/3)*x-(1/2)
4/5-((-2/3)*x)+1/2 = 0
(2/3)*x+4/5+1/2 = 0
2/3*x+13/10 = 0 // - 13/10
2/3*x = -13/10 // : 2/3
x = -13/10/2/3
x = -39/20
x = -39/20
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