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2x-a=3(b-x)
2x-1=3b-3x
2x+3x=3b-a/5
x=3b-a/5
a/2x=b/d /*2x
a=2bx/d/*d
ad=2bx/:2b
x=ad/2b zał 2b≠0
1/y+a=b
1/y=b-a/*y
1=y(b-a)/:b-a
y=1/b-a zał b-a≠0