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Anonymous
So your problem is: 4x=5+5+5+5
OK, so u add all the 5's up: 4x=20
Then you divide 4 by 20: 4/20= 5
Therefore x= 5
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2x-4
x+4x+5=5x+5
x = 4
5. Just do 9 minus 4. 5 plus 4 equals 9
x=4 y=5 9x+7y=?? Replace: 9(4)+7(5)= 71