Доказать тождество. 5-х+3(3х-4)=8х-7

Question

Доказать тождество.
5-х+3(3х-4)=8х-7

Answer 1

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Answer 2

5-x+3(3х-4)=8x-7
5-х+9х-12=8х-7
( 5-12 ) + ( -х+9х ) =8х-7
-7+8х= 8х-7
8х-7=8х-7