Simple beam
P [kN]	alpha [d]	q [kN/m]	a [m]	b [m]	c [m]
20	30	20	2	3	2
Reactions:
RA	77,32	Mf	55,36	Hf	-10,00
verif. M(x=0) =		0,00		OK
	x = 0	x = a-	x = a+	extr.	x = a+b
M	0	-34,64	-34,64	55,36	55,36	55,36
Q	-17,3205080756888	-17,3205080756888	60,00		0	0
N	-10	-10	-10		-10	-10