Prove that if $x$ is a multiple of $a$ and $b$, then $x$ is also a multiple of $\operatorname{lcm}(a,b)$

Question

Prove that if $x$ is a multiple of both $a$ and $b$, then $x$ is also a multiple of $\operatorname{lcm}(a,b)$.

I couldn’t write a proper conditional logic statement. Can anyone help me?