Combine like terms:
-2x - 4y + 5x - 7y = 3x - 11y
-2x + 5x = 3x
-4y + -7y = -11y
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2048
4+1=5. Plus 4 equals 9. Plus 77685769844446473 equals 77685769844446482. Plus 3 equals 77685769844446485. Plus 8 equals 77685769844446493. Plus 1 equals 77685769844446494. Plus 9870998342523322424 equals 1064785604097768918. Plus 4 equals 1064785604097768922.
It is the property that equals plus equals are equals.
the answer is a
If I am correct, 9 plus 7 equals 112.