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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+12+16 = 0
28-4/5*x = 0 // - 28
-4/5*x = -28 // : -4/5
x = -28/(-4/5)
x = 35
x = 35
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