Question

Решите на множестве R уравнения: ( 2x-1)=4

Answer 1

$\frac{1}{5} ( 2x-1)=4$     |*5
$2x-1 = 20$
$2x = 20+1 \\ 2x=21 \\ x= \frac{21}{2} = 10 \frac{1}{2}$

Answer 2

1/5(2x-1)=4
2x-1=20
2x=21
x=21/2=10.5