need help quick!

Because ABCD is a parallelogram, angle(D)  =  60°.

Because AB || DC. the alternate interior angle below the letter A is also 60°.

Angle(A)  =  90° - x°.

Thus the three angles to the left of diagonal line through A are:  (90° - x°) + 60° + 2x°  =  180°.

Solving:     150° + x°  =  180°     --->      x  =  30°