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81/16 = 6*x+(1/4)*x+3/8 // - 6*x+(1/4)*x+3/8
81/16-(6*x)-((1/4)*x)-(3/8) = 0
(-1/4)*x-6*x+81/16-3/8 = 0
75/16-25/4*x = 0 // - 75/16
-25/4*x = -75/16 // : -25/4
x = -75/16/(-25/4)
x = 3/4
x = 3/4
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