tolong di jawab + cara ya

1.
8a + 7 = 79
8a = 72
a = 9

2.
7 - 8/? = 5
2 = 8/?
? = 8/2 = 4

3.
3(n + 5) + n = 23
3n + 15 + n = 23
4n = 8
n = 2

4.
7x - 15 = 18 - 4x
11x = 33
x = 3

5.
?/2 - 2 = 3
?/2 = 5
? = 10

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