bun
(63-5x)-3=20
63-5x=23
5x=63-23
5x=40
x=8
☆succes☆
Răspuns:
8
Explicație pas cu pas:
(7×9-Xx5)-27:9=20
(63-X×5)-27:9=20
(63-Xx5)-3=20
(63-X×5)=20+3
(63-X×5)=23
X×5=63-23
X×5=40
X=40:5
X=8
Verific:
(7×9-8×5)-27:9=
(63-40)-27:9=
23-3=
20✔
