Пошаговое объяснение:
19).
-7(х + 3) + 9 = 5 – 6х
-7x - 21 + 9 = 5 - 6x
7x - 6x = -21 + 9 - 5
x = -17
20).
–(11х - 7) + (7х + 9) = 8
-11x + 7 + 7x + 9 = 8
-4x + 16 = 8
4x = 16 - 8
4x = 8
x = 8 : 4
x = 2
19)17 20)2
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Пошаговое объяснение:
19).
-7(х + 3) + 9 = 5 – 6х
-7x - 21 + 9 = 5 - 6x
7x - 6x = -21 + 9 - 5
x = -17
20).
–(11х - 7) + (7х + 9) = 8
-11x + 7 + 7x + 9 = 8
-4x + 16 = 8
4x = 16 - 8
4x = 8
x = 8 : 4
x = 2
19)17 20)2
Пошаговое объяснение:
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