10. From the sum of 2x – y + 7 and 2y – 10, subtract 4x – 2y – 11.
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Step-by-step explanation:
Addition,
(2x-y+7) + (2y-10)
= 2x-y+7+2y-10
=2x-y+2y+7-10
=2x+y-3.
Subtraction,
= 4x-2y-11 from 2x+y-3
= (4x-2y-11) - (2x+y-3)
= 2x+y-3-4x+2y+11
= 2x-4x+y-2y-2+11
= -2x+3y-8.
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