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4-((2*x)/7) = x/28+5/4 // - x/28+5/4
4-((2*x)/7)-(x/28)-(5/4) = 0
(-2/7)*x-(x/28)-5/4+4 = 0
11/4-9/28*x = 0 // - 11/4
-9/28*x = -11/4 // : -9/28
x = -11/4/(-9/28)
x = 77/9
x = 77/9
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