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1 + 4y = 23
4y = 23-1
4y = 22
y = 22/4
y = 11/2
5.) 24- 5y = 30 -3y
- 5y + 3y = 30 - 24
- 2y = 6
y = 6/-2
y = -3
6.) n/2 = n/7 - 10 <---sederhanakan x 14
7n = 2n - 140
7n -2n = 140
5n = 140
n = 140/5
n = 28