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a(b+c)
kreska ułamkowa = e szukane b=?
d
a·(b+c)/d=e /·d
a·(b+c)=d·e
a·b+a·c=d·e /-a·c
a·b=d·e-a·c /:a
b=(d·e-a·c)/a
b=(d*e-a*c/a)
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a·(b+c)/d=e /·d
a·(b+c)=d·e
a·b+a·c=d·e /-a·c
a·b=d·e-a·c /:a
b=(d·e-a·c)/a
b=(d*e-a*c/a)