?
Please use grouping symbols, to show what's underneath the radical sign.
sqrt(18 - 3x) = x
Is this correct?
\(\displaystyle \sqrt{18 - 3x} \ = \ x\)
This is like your other exercise. Begin by squaring both sides.
You'll get a quadratic equation.
Solve it by factoring the quadratic polynomial.
Please show your work or explain what you're thinking about this, if you would like more help.