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Earn +20 ptsQ: If 5 plus x equals 7 what is x?
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X plus y equals 8 -x plus 2y equals 7?
(3, 5)
What does 3x-7 plus x equals 5?
If: 3x-7+x = 5 Then: x = 3
X plus 7 x-5 equals?
2
What is the value of x in 3x plus 5 equals x plus 19?
x = 7
If x plus y equals 7 and y equals 5 then x plus 5 equals 7?
Yes. This is a logical deduction based on substitution. if x + y = 7 and y = 5 then the value of 5 can be substituted for y to get x + 5 = 7 which can then be solved to get x = 2, meaning the point (2, 5) is a solution to the line x + y = 7 as it is on that line.
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