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Hailey Rodgers
Mathematics
18 May, 02:22
If 3y+5=7x, then 21y-49x=?
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Lee French
18 May, 02:52
0
3y+5=7x
3y=7x-5
y = (7x-5) / 3
...
21y-49x becomes
7 (7x-5) - 49x
49x-35-49x
-35
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