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x in (-oo:+oo)
0 = (4/7)*x-27 // - (4/7)*x-27
0-((4/7)*x)+27 = 0
(-4/7)*x+0+27 = 0
27-4/7*x = 0 // - 27
-4/7*x = -27 // : -4/7
x = -27/(-4/7)
x = 189/4
x = 189/4
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