b) Subtract 12x +3y from the sum of 7x+4y-5z +5 and 6x-7z-8
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Step-by-step explanation:
[(7x+4y-5z+5)+(6x-7z-8)]-(12x+3y)
13x+4y-12z-3-12x-3y
x+y-12z-3
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