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3x+4y= -5 ______1
y-x=4 _____2
solving 2
y-x=4
y=4+x _______3
put 3 in 1
3x+4(4+x)= -5
3x+16+4x =-5
7x +16=-5
7x = 21
x=3 ______4
putting 4 in3
y=4+(3)
y=7
so x=3
y=7
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