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(-1/2)*(8*x+4)+1/5 = 0
1/5-1/2*(8*x+4) = 0
(-1/2*5*(8*x+4))/5+1/5 = 0
1-1/2*5*(8*x+4) = 0
-20*x-9 = 0
(-20*x-9)/5 = 0
(-20*x-9)/5 = 0 // * 5
-20*x-9 = 0
-20*x-9 = 0 // + 9
-20*x = 9 // : -20
x = 9/(-20)
x = -9/20
x = -9/20
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