Normally, I would go through the entire procedure to work out the answer for such an equation, but it is a bit awkward in this case. The first step in this equation would be to subtract 4 from each side, leaving us with 2x=0. Obviously, x is therefore 0 as well.
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Infinite, both equations are equivalent and all possible solutions can be represented on the graph y = 4 - x
x equals 4
If x=4 then 2x+7 =
There are two solutions and they are: x = -1 and y = 3
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.