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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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What is the ANSWER TO -5 plus x equals -2?
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