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12-((3/5)*x)-((1/5)*x) = 16 // - 16
12-((3/5)*x)-((1/5)*x)-16 = 0
(-3/5)*x+(-1/5)*x-16+12 = 0
-4/5*x-4 = 0 // + 4
-4/5*x = 4 // : -4/5
x = 4/(-4/5)
x = -5
x = -5
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