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(1/2)*x-(3/5) = -2/3 // + -2/3
(1/2)*x-(3/5)-(-2/3) = 0
(1/2)*x-3/5+2/3 = 0
1/2*x+1/15 = 0 // - 1/15
1/2*x = -1/15 // : 1/2
x = -1/15/1/2
x = -2/15
x = -2/15
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