(5х + 7) - (8х + 13) = 9
5х + 7 - 8х - 13 = 9
5х - 8х = 9 - 7 + 13
-3х = 15
х = 15 : (-3)
х = -5
- - - - - - - - - -
Проверка:
(5 · (-5) + 7) - (8 · (-5) + 13) = 9
(-25 + 7) - (-40 + 13) = 9
-18 - (-27) = 9
-18 + 27 = 9
9 = 9 - верно.
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
(5x+7)-(8x+13)=95x+7-8x-13=9
5x-8x=9-7+13
-3x=15
X=15:-3
X=-5
Відповідь: -5.
(5х + 7) - (8х + 13) = 9
5х + 7 - 8х - 13 = 9
5х - 8х = 9 - 7 + 13
-3х = 15
х = 15 : (-3)
х = -5
- - - - - - - - - -
Проверка:
(5 · (-5) + 7) - (8 · (-5) + 13) = 9
(-25 + 7) - (-40 + 13) = 9
-18 - (-27) = 9
-18 + 27 = 9
9 = 9 - верно.