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12x-15y=21
x=(5+13y)/20
12(5+13y)/20-15y=21
x=(5+13y)/20
3+7.8y-15y=21
x=(5......
-7,2y=18/-7,2
x=....
y=-2,5
x=(5-32,5)/20
y=-2.5
x=0,25-1,625
y=-2.5
x=-1,325
y=2.5