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2x + 3y = 19 · 1 ⇒ 2x + 3y = 19
x - y = - 8 · 2 ⇒ 2x - 2y = - 16 -
5y = 35
y = 7
2x + 3y = 19
2x + 3(7) = 19
2x = -2
x = -1
nilai x - 7y = -1 - 7(7) = -50