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360-(4*x) = 120-((2/3)*x) // - 120-((2/3)*x)
(2/3)*x-(4*x)-120+360 = 0
(2/3)*x-4*x-120+360 = 0
240-10/3*x = 0 // - 240
-10/3*x = -240 // : -10/3
x = -240/(-10/3)
x = 72
x = 72
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