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6-((4/5)*x) = -7 // + 7
6-((4/5)*x)+7 = 0
(-4/5)*x+6+7 = 0
13-4/5*x = 0 // - 13
-4/5*x = -13 // : -4/5
x = -13/(-4/5)
x = 65/4
x = 65/4
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