22=7x+1 (take 1 of each side of the equals)
21=7x (divide each side by seven)
3=x (BAM! answer)
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It has one double solution.
It's the equation of a straight-line graph. Every point on the line is a solution of the equation. There are an infinite number of them.
-5
Without an indication of the equals sign, this is not an equation.
Not sure what you mean; that equation certainly has a solution.