-2(a-4)+10-(2a+1)+2(2-a) =
-2(a-4)+10-(2a+1)+2(2-a) =-2a+8+10-2a-1+4-2a=-6a+21
-2(a-4)+10-(2a+1)+2(2-a)=
-2a+8+10-2a-1+4-2a=
-6a+21
-6a=-21/:(-6)
a=3,5
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-2(a-4)+10-(2a+1)+2(2-a) =-2a+8+10-2a-1+4-2a=-6a+21
-2(a-4)+10-(2a+1)+2(2-a)=
-2a+8+10-2a-1+4-2a=
-6a+21
-6a=-21/:(-6)
a=3,5