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6-((4*x)/16) = 5*x-(7.5/(-20)) // - 5*x-(7.5/(-20))
7.5/(-20)-((4*x)/16)-(5*x)+6 = 0
(-1/4)*x-5*x+7.5/(-20)+6 = 0
5.625-21/4*x = 0 // - 5.625
-21/4*x = -5.625 // : -21/4
x = -5.625/(-21/4)
x = 1.07142857
x = 1.07142857
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