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20 = (4*x)/5-4 // - (4*x)/5-4
4-((4*x)/5)+20 = 0
(-4/5)*x+4+20 = 0
24-4/5*x = 0 // - 24
-4/5*x = -24 // : -4/5
x = -24/(-4/5)
x = 30
x = 30
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