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2*x-((6*x)/1)-(6/1)-(1*6)-15-1+1 = 0
2*x-6*x-15-6-6-1+1 = 0
-4*x-27 = 0 // + 27
-4*x = 27 // : -4
x = 27/(-4)
x = -27/4
x = -27/4
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