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x in (-oo:+oo)
144 = (5*x)/78 // - (5*x)/78
144-((5*x)/78) = 0
(-5/78)*x+144 = 0
144-5/78*x = 0 // - 144
-5/78*x = -144 // : -5/78
x = -144/(-5/78)
x = 11232/5
x = 11232/5
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