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x in (-oo:+oo)
5*(x/6-(x/2))-(7*(x/2-(x/4))) = 9 // - 9
5*(x/6-(x/2))-(7*(x/2-(x/4)))-9 = 0
5*(x/6-(x/2))-7*(x/2-(x/4))-9 = 0
-1/3*5*x-7*1/4*x-9 = 0
-1/3*5*x-7*1/4*x-9 = 0
-41/12*x-9 = 0
-41/12*x-9 = 0
-41/12*x-9 = 0 // + 9
-41/12*x = 9 // : -41/12
x = 9/(-41/12)
x = -108/41
x = -108/41
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