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5x - y = 7 | *3 |
=> 15x - 10y = 35
15x - 3y. = 21
=> 7y = 7
y = 1
=> 3x - 2y = 7
3x - 2(7) = 7
3x - 14 = 7
3x = 7 + 14
3x = 21
x = 7
nilai x = 7
nilai y = 1