Question

Помогите пожалуйста !
a) 9 +13x = 35+26x
б) 7/9х + 3 = 2/3х +5
в) 0,81х - 71 = 1,11х + 1
г) 11х + 7ч - 24х =42

Answer 1

a) 9 + 13x = 35 + 26x 
13х - 26х = 35 - 9
-13х = 26
х = $- \frac{26}{13}$
х = -2

б) 7/9х + 3 = 2/3х + 5 
$\frac{7x}{9} - \frac{2x}{3} = 5 - 3 \\ \frac{7x}{9} - \frac{6x}{9} = 5 - 3 \\ \frac{x}{9} = 2 \\ x = 2 * 9 \\ x = 18$

в) 0,81х - 71 = 1,11х + 1
0,81х - 1,11х = 1 +  71
-0,3x = 72
x = $- \frac{72}{0,3}$
x = -240

г) 11х + 7х - 24х = 42
-6х = 42
х = $-\frac{42}{6}$
х = -7