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2x-2a+5-3x-1=0
-x-2a+4=0
-2a=x-4
-2a=5-4
-2a=1 //(-2)
a=-1/2
// obustronne dzielenie
/ kreska ułamkowa
2(5-a)+5=3*5-1
10-2a+5=14
-2a=14-15
-2a=-1
a=1/2