1. 7x-6=8

2. 4x+5=21

3.x-12=

D) He points to the fact that the Soviet Union has failed to keep pace with the successes of the West.

Explanation:

This is based on the speech, “Tear Down This Wall” made by President Ronald Reagan when he visited Berlin on June 12, 1987.

He made mention of the fact that in the 1950s, Premier Khrushchev of the Soviet Union had implied that they would surpass the West but instead what was now obvious was that the Soviet Union had been outpaced by the countries of the West and were suffering from lesser standards of health, little food and technological backwardness.