7x-y-6-0 and 21x+3y-18-0 has
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Answer:
7x-y-6-0=0
7x-y=0+6
7x=6+y
x=6+y/7
21x+3y-18-0
21(6+y/7)+3y-18=0
3×6+y+3y-18
18+4y-18
18-18+4y=0
4y=0
y=0/4
y=0
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