4x+3(x-7)=14 тогда x=?. Created by kimkrystal. matematika-ru

4x+3(x-7)=14 тогда x=?...

$\displaystyle \tt 4x+3\cdot(x-7)=14\\\displaystyle \tt 4x+3x-21=14\\\displaystyle \tt 7x-21=14\\\displaystyle \tt 7x=14+21\\\displaystyle \tt 7x=35\\\displaystyle \tt x=35\div7\\\displaystyle \tt \bold{x=5}$

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