2	x	+	3	=	15
2x	=	15-3
2x	=	12
x	=	6
x	=	6

25x²+15x-2=0
x=-b±raizde-b²-4ac/2a
x	=	-15	±	raiz de	15²	-	4	-25	*	-2	/2*25
x	=	-15	±	raiz de	225	-	200	/	-50
x	=	-15	±	raiz de	25	/-50
x1	=	-15	+	5	/	-50						x2	=	-20	/	-50
x1	=	-10	/	-50								x2	=	0.4
		0.2