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