Answer:
3(n+21) = 12 n= -17
Step-by-step explanation:
3n + 63 = 12
3n = -51
n = -51/3
n= -17
45
plug in 3 where the xs are
2(3)(6(3)-5(3))+(3)^2(5(3)-4(3)=45
2(3)=6
6(3)=18
-5(3)=15
(3)^2=9
5(3)=15
-4(3)=-12
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