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54/5 = 4*x+(1/5)*x-6 // - 4*x+(1/5)*x-6
54/5-(4*x)-((1/5)*x)+6 = 0
(-1/5)*x-4*x+54/5+6 = 0
84/5-21/5*x = 0 // - 84/5
-21/5*x = -84/5 // : -21/5
x = -84/5/(-21/5)
x = 4
x = 4
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