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`a)x-12=(-9)-15`
`⇒x-12=-24`
`⇒x=-24+12`
`⇒x=-12`
`b) x - (17 - x) = x - 7`
`⇒x-17+x=x-7`
`⇒x+x-x=-7+17`
`⇒x=10`
`c)2 + |x +3| = 10`
`⇒|x+3|=10-2`
`⇒|x+3|=8`
`⇒`\(\left[ \begin{array}{l}x+3=8\\x+3=-8\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=5\\x=-11\end{array} \right.\)