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x + (x - 8) = 10
2x - 8 = 10
2x = 18
x = 9
y = 1/2
- 2y = x-8
- 10 = x+2y
maka di persamaan 10 = x + 2y, 2y nya diubah menjadi x-8
10 = x + (x-8)
10 = 2x - 8
2x = 18
x = 18 : 2
= 9