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15/20 = (4*x)/20+10/20 // - (4*x)/20+10/20
15/20-((4*x)/20)-(10/20) = 0
(-1/5)*x+15/20-1/2 = 0
1/4-1/5*x = 0 // - 1/4
-1/5*x = -1/4 // : -1/5
x = -1/4/(-1/5)
x = 5/4
x = 5/4
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