Question

calculati 1. 2x-1=3(x+1)-7 2. -2+2(x+1)=3x-5

Answer 1

Răspuns:

Exercitiul 1:

$2x-1=3(x+1)-7$

$2x-1=3x+3-7$

$2x-1=3x-4$

$2x-3x-1 = -4 + 1$

$-x = -3$

$x = 3$

Exercitiul 2:

$-2+2(x+1)=3x-5$

$-2+2x+2=3x-5$

$2x = 3x - 5$

$2x-3x=5$

$-x=-5$

$x=5$

Answer 2

1)

$\bf 2x-1=3\cdot (x+1)-7$

$\bf 2x-1=3x+3-7$

$\bf 2x-1=3x-4$

$\bf 2x-1+4 =3x$

$\bf 2x+3 =3x$

$\bf 3 =3x-2x$

$\boxed{\bf x = 3}$

2)

$\bf -2+2\cdot(x+1)=3x-5$

$\bf -2+2x+2=3x-5$

$\bf 2x=3x-5$

$\bf 2x+5=3x$

$\bf 5=3x-2x$

$\boxed{\bf x = 5}$