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12-((4/5)*x)+15 = 5 // - 5
12-((4/5)*x)-5+15 = 0
(-4/5)*x-5+12+15 = 0
22-4/5*x = 0 // - 22
-4/5*x = -22 // : -4/5
x = -22/(-4/5)
x = 55/2
x = 55/2
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