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12.6*x-((4/12)*x)-(3/0.5) = 0
12.6*x+(-1/3)*x-6 = 0
12.26666667*x-6 = 0 // + 6
12.26666667*x = 6 // : 12.26666667
x = 6/12.26666667
x = 0.48913043
x = 0.48913043
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