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4*x-((4/10)*x)-(15*20*x)+(15/3)*x-(3*6*x)-((12/20)*x)+20 = 0
4*x+(-2/5)*x-300*x+(15/3)*x-18*x+(-3/5)*x+20 = 0
20-310*x = 0 // - 20
-310*x = -20 // : -310
x = -20/(-310)
x = 2/31
x = 2/31
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