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x + 3y -2=0 ... (2)
x = 2-3y
Sustituimos esa x en la ecuación (1)
3(2-3y)+5y+1=0
6-9y+5y+1=0
6-4y+1=0
7=4y
y = 7/4
Sustituimos y en (2)
x+3(7/4)-2=0
x+ (21/4)-2=0
x= 2-(21/4)
x= -13/4