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x in (-oo:+oo)
(3/4)*x-((6/7)*(x+28)) = (17/28)*x+9/7 // - (17/28)*x+9/7
(3/4)*x-((6/7)*(x+28))-((17/28)*x)-(9/7) = 0
(-6/7)*(x+28)+(3/4)*x+(-17/28)*x-9/7 = 0
(3*x)/4-6/7*(x+28)+(-17*x)/28-9/7 = 0
(-6/7*4*7*28*(x+28))/(4*7*28)+(3*7*28*x)/(4*7*28)+(-17*4*7*x)/(4*7*28)+(-9*4*28)/(4*7*28) = 0
3*7*28*x-6/7*4*7*28*(x+28)-17*4*7*x-9*4*28 = 0
-84*x-476*x-18816-1008 = 0
-560*x-18816-1008 = 0
-560*x-19824 = 0
(-560*x-19824)/(4*7*28) = 0
(-560*x-19824)/(4*7*28) = 0 // * 4*7*28
-560*x-19824 = 0
-560*x-19824 = 0 // + 19824
-560*x = 19824 // : -560
x = 19824/(-560)
x = -177/5
x = -177/5
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