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(-1/2)*x+8 = 2*x+71/12 // - 2*x+71/12
(-1/2)*x-(2*x)-(71/12)+8 = 0
(-1/2)*x-2*x-71/12+8 = 0
25/12-5/2*x = 0 // - 25/12
-5/2*x = -25/12 // : -5/2
x = -25/12/(-5/2)
x = 5/6
x = 5/6
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