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x=2ab+7 x= 2(3)(5) +7 x=30+7 x=37
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.
If: 3x-7+x = 5 Then: x = 3
x = 2
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