What must be added to 7x - 6y + 15 to get a sum equal to sum of x + 9y - 1 and - 9x+8y - 11?
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Step-by-step explanation:
Let the number to be added be a
7x-6y+15+a=x+9y-1-9x+8y-11
a=x+9y-1-9x+8y-11-7x+6y-15
=-15x+23y-27
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