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7*x+4/(-3) = 4/5 // - 4/5
7*x+4/(-3)-(4/5) = 0
7*x+4/(-3)-4/5 = 0
7*x-32/15 = 0 // + 32/15
7*x = 32/15 // : 7
x = 32/15/7
x = 32/105
x = 32/105
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