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-b - x ÷ b + x = 2a + b, b ≠ -x, otrzymamy a=b+1 ÷ 2
-(b + x )/ (b + x) = 2a + b
-1= 2a + b
-1-b=2a
a=(-1-b)/2
nie otrzymamy a=b+1 ÷ 2