Answer:
Infinitely many solutions.
Step-by-step explanation:
x-2y=-3
14y-7x=21
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simplify 14y-7x=21 into 2y-x=3
2y-x=3
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x=2y+(-3)
x=2y-3
2y-(2y-3)=3
2y-2y+3=3
0+3=3
infinitely many solutions
