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9-((1/2)*x) = 4*x+5 // - 4*x+5
9-((1/2)*x)-(4*x)-5 = 0
(-1/2)*x-4*x-5+9 = 0
4-9/2*x = 0 // - 4
-9/2*x = -4 // : -9/2
x = -4/(-9/2)
x = 8/9
x = 8/9
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