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(1/2)*x-(3/5) = -4/15 // + -4/15
(1/2)*x-(3/5)-(-4/15) = 0
(1/2)*x-3/5+4/15 = 0
1/2*x-1/3 = 0 // + 1/3
1/2*x = 1/3 // : 1/2
x = 1/3/1/2
x = 2/3
x = 2/3
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