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-((1/2)*x)-4 = 4*x-(80/11) // - 4*x-(80/11)
80/11-((1/2)*x)-(4*x)-4 = 0
(-1/2)*x-4*x+80/11-4 = 0
36/11-9/2*x = 0 // - 36/11
-9/2*x = -36/11 // : -9/2
x = -36/11/(-9/2)
x = 8/11
x = 8/11
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