Beginning C and Computer Organization - C Statement that sets to 0 some bits without disturbing other bits

Question

Write one or more C statements that clears (i.e., sets to 0) bits 11 and 12 of the variable "x" without disturbing the other bits using bit-level C operators. The variable mask, declared below, may be helpful.

int mask = 0x00001800;
int x = arbitrary_value;