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27/40 = 7/20-((1/4)*x) // - 7/20-((1/4)*x)
(1/4)*x+27/40-(7/20) = 0
(1/4)*x+27/40-7/20 = 0
1/4*x+13/40 = 0 // - 13/40
1/4*x = -13/40 // : 1/4
x = -13/40/1/4
x = -13/10
x = -13/10
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