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(-4/2)*(9*x-20)-(3*x) = (4/5)*x-6 // - (4/5)*x-6
(-4/2)*(9*x-20)-(3*x)-((4/5)*x)+6 = 0
(-4/2)*(9*x-20)-3*x+(-4/5)*x+6 = 0
(-4*x)/5-2*(9*x-20)-3*x+6 = 0
(-2*5*(9*x-20))/5+(-3*5*x)/5+(-4*x)/5+(5*6)/5 = 0
5*6-2*5*(9*x-20)-3*5*x-4*x = 0
30-105*x-4*x+200 = 0
30-109*x+200 = 0
230-109*x = 0
(230-109*x)/5 = 0
(230-109*x)/5 = 0 // * 5
230-109*x = 0
230-109*x = 0 // - 230
-109*x = -230 // : -109
x = -230/(-109)
x = 230/109
x = 230/109
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