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20 = (4/5)*x-20 // - (4/5)*x-20
20-((4/5)*x)+20 = 0
(-4/5)*x+20+20 = 0
40-4/5*x = 0 // - 40
-4/5*x = -40 // : -4/5
x = -40/(-4/5)
x = 50
x = 50
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