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4*x-((50/5)*x)-50 = 7/9 // - 7/9
4*x-((50/5)*x)-(7/9)-50 = 0
4*x-10*x-7/9-50 = 0
-6*x-457/9 = 0 // + 457/9
-6*x = 457/9 // : -6
x = 457/9/(-6)
x = -457/54
x = -457/54
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