If 4x = 8, then x = 2
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I think this might read "4x+5 = 4x-1". Subtracting 4x from both sides cannot upset the equality, and then you have +5 = -1, which is nonsense. One moral of this is "make sure your equation makes sense, and actually includes an = sign."
It's the equation of a straight line. Every point on the line is a solution to the equation. There are an infinite number of them.
4x - 16 = 64Add 16 to each side of the equation:4x = 80Divide each side by 4:x = 20
Let the unknown number be x: 4x-7 = 13 Moving -7 to the other side of the equation changes it to +7: 4x = 13+7 4x = 20 Divide both sides of the equation by 4 to find the value of x: x = 5
19