Resolva os sistemas de equações:
a)3x+y=10
x+2y=6

b)4x-3y=0
-8x+2y=24

c)3x-y=7
4x-5y-2

d)x-5y=0
3x+10y=50

e)8x+20y= -24
7x+4y=6

f)5x-8y= -9
y= 6-x

g)x-2y= -21
3x+y=0

h)x+y=10
4x= y=25
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