Simplify: 3x2+6x3x\dfrac{3x^2 + 6x}{3x}3x3x2+6x (assume x≠0x \neq 0x=0).
x+2x + 2x+2
x+6x + 6x+6
3x+23x + 23x+2
x2+2x^2 + 2x2+2