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4*x-248 = (5/9)*x // - (5/9)*x
4*x-((5/9)*x)-248 = 0
4*x+(-5/9)*x-248 = 0
31/9*x-248 = 0 // + 248
31/9*x = 248 // : 31/9
x = 248/31/9
x = 72
x = 72
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