Answer: x is -10
Explanation:
x - 4 = 16+3x
Transposing the x, and arranging in one side of equation
x - 3x = 16 + 4
now we changed the positions of x and we can simplify it.
so,
x - 3x = -2x -----------------(1)
16 + 4 = 20 ----------------(2)
Therefore the x - 3x = 16 + 4 will change into -2x = 20
Then x = 20 ÷ -2 = -10
x = -10