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12-((3/5)*x)-(1/5) = -16 // + 16
12-((3/5)*x)-(1/5)+16 = 0
(-3/5)*x-1/5+12+16 = 0
139/5-3/5*x = 0 // - 139/5
-3/5*x = -139/5 // : -3/5
x = -139/5/(-3/5)
x = 139/3
x = 139/3
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