Question

линейные уравнения с одной переменной 2х-7=13 и х+5в=15; 2-х/5-х/15=1/3; 3(х-7)=144

Answer 1

$1)2x - 7 = 13 \ 2x =1 3 + 7 \ 2x = 20 \ x = 20 div 2 \ x = 10$
$2)x + 5b = 15 \ x = 15 - 5b$
$3)2 - frac{x}{5} - frac{x}{15} = frac{1}{3} \ 30 - 3x - x = 5 \ 30 - 4x = 5 \ 4x = 30 - 5$
$4x = 25 \ x = 25 div 4 \ x = 6 frac{1}{4} = 6.25$
$4)3x - 21 = 144 \ 3x = 144 + 21 \ 3x = 165 \ x = 165 div 3 \ x = 55$