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(4/5)*(2*x-(2/3)) = 0
(4/5)*(2*x-2/3) = 0
4/5*(2*x-2/3) = 0
2*x-2/3 = 0 // + 2/3
2*x = 2/3 // : 2
x = 2/3/2
x = 1/3
x = 1/3
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