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3x + 4y = 13
3x + 4(2x+6) = 13
3x + 8x + 24 = 13
11x + 24 = 13
11x = 13-24
11x = -11
x = -1
y = 2x+6
y = 2*(-1) +6
y = -2 + 6
y = 4
penyelesaiannya (-1,4)