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17 = (4/5)*x-3 // - (4/5)*x-3
3-((4/5)*x)+17 = 0
(-4/5)*x+3+17 = 0
20-4/5*x = 0 // - 20
-4/5*x = -20 // : -4/5
x = -20/(-4/5)
x = 25
x = 25
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