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(4/5)*x-(4/5) = -8/15 // + -8/15
(4/5)*x-(4/5)-(-8/15) = 0
(4/5)*x-4/5+8/15 = 0
4/5*x-4/15 = 0 // + 4/15
4/5*x = 4/15 // : 4/5
x = 4/15/4/5
x = 1/3
x = 1/3
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