Question

Rezolvati ecuatia [3 x (x + -2,7) - 4,2] : 1,5 = 7,2

Va rog!!

Answer 1

$[3•(x+-2,7)-4,2]:1,5=7,2$
$[3x-8,1-4,2]:\dfrac{15}{10}=7,2$
$[3x-12,3]\cdot\dfrac{10}{15}=7,2~{simplifici~\dfrac{10}{15}~cu~5}$
$[3x-12,3]\cdot\dfrac{2}{3}=7,2$
$2x-12,3\cdot\dfrac{2}{3}=7,2$
$2x-\dfrac{123}{10}\cdot\dfrac{2}{3}=7,2$
$2x-\dfrac{41}{5}=7,2$
$2x=7,2+\dfrac{41}{5}$
$2x=7,2+8,2$
$2x=15,4$
$x=15,4:2$
$x=\fbox{7,7}$