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x + 2y = 5 | x1 | x + 2y = 5 +
7x = 21
x = 21 : 7 = 3
x + 2y = 5
3 + 2y = 5
2y = 5 - 3
2y = 2
y = 1
Jadi, x = 3 dan y = 1
x+2y=5 |×1| → x+2y=5
----------- +
7x =21
x=3
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