3x-ay+bz= a=3c b=12c³ x=5c³+2 y=6c²-c+13 z=5c-1
=3(5c³+2)-3c(6c²-c+13)+12c³(5c-1)=
=15c³+6-18c³+3c²-39c+60c⁴-12c³=
=60c⁴-15c³+3c²-39c+6
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3x-ay+bz= a=3c b=12c³ x=5c³+2 y=6c²-c+13 z=5c-1
=3(5c³+2)-3c(6c²-c+13)+12c³(5c-1)=
=15c³+6-18c³+3c²-39c+60c⁴-12c³=
=60c⁴-15c³+3c²-39c+6