Answer:
18
Step-by-step explanation:
6 + 6 + 6 = 18
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c)
(10x+5)-(-23-2x)=
10x+5+23+2x
=12x+28
2x+5x^2-(3x+7x^2)=
2x+5x^2-3x-7x^2
= -2x^2-1
Simplify.