m1+m2u2=(m+m2)*u
m2u2=mu+m2u-m1u
m2u2-m2u=mu-m1u
m2(u2-u)=mu-m1u
m2=(mu-m1u)/u2-u
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m1+m2u2=(m+m2)*u
m2u2=mu+m2u-m1u
m2u2-m2u=mu-m1u
m2(u2-u)=mu-m1u
m2=(mu-m1u)/u2-u