17 Smplify:7 - {6 - 12 = (5 + 9x2 -19)}
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Step-by-step explanation:
7-{6-12=5+9x^2-19}
13=21-9x^2
9x^2+8=0
factor(9x^2-8)
(-2 root(2))/3 and (2 root(2))/3
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