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p in (-oo:+oo)
7-(p/3) = -((1/3)*(p+3))-p // + -((1/3)*(p+3))-p
(1/3)*(p+3)-(p/3)+p+7 = 0
1/3*(p+3)-p/3+p+7 = 0
(1/3*3*(p+3))/3-p/3+(3*p)/3+(3*7)/3 = 0
1/3*3*(p+3)-p+3*p+3*7 = 0
3*p+3+21 = 0
3*p+24 = 0
(3*p+24)/3 = 0
(3*p+24)/3 = 0 // * 3
3*p+24 = 0
3*p+24 = 0 // - 24
3*p = -24 // : 3
p = -24/3
p = -8
p = -8
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