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7-((4/5)*x) = 10 // - 10
7-((4/5)*x)-10 = 0
(-4/5)*x-10+7 = 0
-4/5*x-3 = 0 // + 3
-4/5*x = 3 // : -4/5
x = 3/(-4/5)
x = -15/4
x = -15/4
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